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LOS ANGELES (AP) — The 16-year-old boy who fatally shot two fellow students and wounded three others last week at a Southern California high school used an unregistered, untraceable “ghost gun,” Los Angeles County Sheriff Alex Villanueva said Thursday.Villanueva told media outlets that Nathaniel Berhow’s .45 caliber, 1911-model replica semi-automatic pistol was assembled from gun parts and did not have a serial number.Such weapons are a growing problem for law enforcement around the country because the parts are easy to obtain and the guns take limited expertise to build. In Southern California, federal authorities say one-third of all the firearms seized are ghost guns.California has among the strictest gun laws in the country, but they are based on traditional firearms that are made by manufacturers and labeled so ownership can be traced.RELATED: Santa Clarita high school shooting: 2 killed, 3 hurt; suspected shooter in 'grave' condition"Congress and state legislatures enact all these crimes about gun registration but now the gun industry is creating a way to just bypass the entire thing by creating a mechanism to manufacture weapons yourself," Villanueva said.It’s legal to purchase gun kits and assemble them at home. That method allows the purchaser, sometimes a minor or other person prohibited from owning firearms, to avoid background checks required to purchase ready-made guns from licensed dealers.Thomas Groneman, a detective sergeant with the Suffolk County Police Department in New York, said his agency built their own Glock-replica handgun from parts they ordered online as an experiment earlier this year.“It was ridiculously easy to do it,” he said. “It’s scary because anybody — convicted felons, people with psychological issues — can order it online.”RELATED: 'I'm scared': Students relive escape from Saugus High School shootingIn 2017, a Northern California gunman built his own rifles — despite a court order prohibiting him from having guns — and killed his wife and four others in a rampage.While hobbyists have long been able to use spare parts to create a firearm, modern technology has made it far easier to build a deadly weapon.Adam Winkler, a gun policy expert and professor at the University of California, Los Angeles, said that means more criminals will use them and it will be more difficult for police to solve crimes.“Anytime you can trace a gun, you have a little bit more information,” he said. “How did this gun get here? Who sold it, who was the gunmaker, who was the first person they sold it to and what happened?”Police don’t yet know where and when Berhow got the handgun he used to shoot students at Saugus High School in the Los Angeles suburb of Santa Clarita. As the school day was starting on Nov. 14, he pulled the gun from his backpack in an open-air quad and in 16 seconds shot five students at random, police said.RELATED: Santa Clarita school shooting victim named; Suspected gunman diesBerhow counted his rounds, saving the last bullet for himself, investigators said. He died from a head wound the next day.Anne Muehlberger, 15, and Dominic Blackwell, 14, were killed. The other three students were hospitalized and the last of them went home earlier this week.Berhow’s father was an avid hunter who died two years ago. He had six registered guns, but officials found several other unregistered firearms in the family home after the shooting and are working to determine their history.The sheriff said Berhow’s motive remains a mystery, even after investigators searched his home and interviewed 45 people. Berhow’s mother had no idea of her son’s plans, Villanueva said.Authorities said Berhow had shown no signs of violence and didn’t appear to be linked to any ideology or terrorist group. He ran cross country, was a Boy Scout and had a girlfriend.The sheriff’s department is working with federal authorities to unlock Berhow’s cellphone, Villanueva said. 3943

LOS ANGELES (CNS) - The ShakeAlertLA app that drew criticism for not notifying users during the July 4 and 5 earthquakes will begin sending alerts for smaller quakes, officials announced Wednesday.Starting this month, the early warning system will alert residents of Garcetti, CalTech and the United States Geological Survey. The previous threshold was magnitude 5.0.``Every day we are communicating the importance of preparedness, so that every Angeleno has the tools and resources they need to build a better life, and then protect that life when disaster strikes,'' Garcetti said.``Updates to ShakeAlertLA will result in an even more responsive application, making our city stronger and our families safer.''The USGS ShakeAlert Earthquake Early Warning System for the West Coast detects significant earthquakes quick enough that ShakeAlerts can reach people a few seconds before shaking starts.``The USGS, through its scientific expertise, creates ShakeAlert earthquake early warnings, but in order to be successful, our public and private partners must develop technologies to use and distribute the alerts,'' said Doug Given, the USGS' earthquake early warning coordinator.ShakeAlertLA was developed in collaboration with USGS, AT&T and The Annenberg Foundation to combine USGS sensor network with mobile app technology, according to the Mayor's Office. It launched at the end of last year.When people receive a ShakeAlert notification, they are advised to take protective action, such as drop, cover and hold on.More information can be found at www.shakealert.org. 1582

Lorenza Marrujo is 67 years old and less than five feet tall — but she's no weakling.An intruder recently confronted Marrujo at her seniors apartment complex in Fontana, California. Not only did she protect herself, but her neighbors, too."As he was coming towards me, I said, 'back off.' Right away," Marrujo said.Marrujo has 26 years of martial arts training, so when she told the intruder to back off, he listened. Unfortunately, he made his way to the apartment of 81-year-old Elizabeth McCray — Marrujo's neighbor."He grabbed me and shook me, and I went down on the floor," McCray said.Marrujo heard McCray's screams and went to help."I squeezed myself between her and him. I put mama on the side, and I jumped on him, and I was punching him and everything," Marrujo said. "And I had the cane against his throat."Marrujo said she didn't want to kill him, so she held him down with her hands."He lifted up and tried to twist my hand. At the same time, I twisted his and turned it around real fast," Marrujo said. "And he was saying, 'you're hurting me, you're hurting me.' And I said, 'I don't care. I don't care what happens to you. You had no right to hurt an elderly person.'"McCray was stunned by her neighbor's bravery."I didn't expect that little lady would be that brave," she said. "I was trembling. I grabbed her by the leg. I said, 'could you be careful; you're gonna kill us.' She said, 'not tonight.'"Police later arrived on the scene and took the intruder into custody. Despite Marrujo's bravery, police say it's not a good idea to attack an intruder."We don't recommend you just jumping in," said Jennie Venzor, a spokesperson for the Fontana Police Department. "We recommend that you dial 911 for emergency assistance, which, in this case, she did that, and she also jumped in. What she told me is that her training kicked in, and it was like a muscle memory. She knew she had to help her friend out."McCray was taken to the hospital for treatment and released the next day. 2001

LOS ANGELES (AP) — Los Angeles County prosecutors are joining other district attorneys to use technology to wipe out 66,000 old marijuana convictions years after California voters broadly legalized the drug. The county is working with the nonprofit Code for America, which uses computer algorithms to find eligible cases that are otherwise hard to identify in old court documents. The group has offered its technology free to all of the state's 58 district attorneys. The program identifies eligible cases and automatically fills out forms to file with the courts. Prosecutors this week asked an Los Angeles judge to dismiss convictions for cases that date back to 1961. 679

LOS ANGELES (AP) — The pilot of a helicopter that crashed into a Southern California hillside, killing Kobe Bryant and eight others, was reprimanded five years ago for flying without permission into airspace while he had reduced visibility. A Federal Aviation Administration enforcement record says Ara Zaboyan was counseled in 2015 after he strayed into Los Angeles International Airport space after being denied permission to cross because of reduced visibility. The FAA record says Zobayan admitted and took responsibility for the error. RELATED: NTSB: Helicopter was 20-30 feet from clearing mountainReporter suspended for inaccurate Bryant reportingWreckage of helicopter crash moved to ArizonaZaboyan, Bryant, Bryant's daughter and six others died last month when their helicopter hit a hillside northwest of Los Angeles in cloudy weather. The NTSB said it could take as many as 18 months to issue its full report. In the agency's initial findings, investigators say the helicopter came about 20 to 30 feet from avoiding the mountain, but descended rapidly about 2,000 feet per minute, from 2,300 feet to 1,085 feet above sea level.In 2004, the NTSB recommended to the FAA that all helicopters be equipped with a Terrain Awareness and Warning System, but the FAA has yet to follow the recommendation, according to California Rep. Brad Sherman. 1357

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