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Cellphones and social media were at the heart of the investigation that led to an arrest in the killing of a University of Utah student who vanished nearly two weeks ago.Investigators tracking her cellphone discovered that 23-year-old Mackenzie Lueck and the man expected to be charged with her murder were both in the park where she was last seen on June 17 within a minute of one another.That was around the time Lueck's phone stopped receiving data or location services, police said.Ayoola Ajayi, 31, was arrested Friday and is expected to be charged with aggravated murder. He also faces charges of aggravated kidnapping, obstruction of justice and desecration of a body, according to Salt Lake City Police Chief Mike Brown.Police find her pictures on his phoneAfter Lueck disappeared, the suspect originally denied knowing what she looked like, Brown said. But several pictures of her were found on his phone, and the "digital footprint" has continued even after the arrest, police said.An Instagram account that Lueck's sorority sister confirmed belongs to the missing student followed another user on or about Wednesday, CNN verified.Brown confirmed that investigators are looking into the activity on the account."This is a digital forensic investigation," he said. "This is covering computers, cellphones, IP addresses, URLs, texting apps."Forensic evidence is also discovered But the investigation is not just limited to digital footprints.Investigators also found forensic evidence after they searched Ajayi's home and property Wednesday, police said. As they did, his neighbors told police they saw him using gasoline to burn something in his backyard on June 17 and 18, Brown said.Police said the search yielded multiple items of evidence."A forensic excavation of the burn area was conducted, which resulted in the finding of several charred items that were consistent with personal items of Mackenzie Lueck," Brown told reporters.Police also discovered charred material that was determined to be female human tissue consistent with Lueck's DNA profile, he said. A mattress investigators have been trying to find has been located, police tweeted Friday night, without providing additional details.She stopped communicating about 3 a.m. Lueck texted her parents at 1 a.m. on June 17 when she landed at Salt Lake City International Airport, police said. She was seen on airport surveillance walking through baggage claim before taking Lyft to Hatch Park.The Lyft driver said she did not appear to be in distress, according to Salt Lake City police assistant chief Tim Doubt.Police said Friday that all communications with Lueck's phone ceased around 3 a.m. that morning -- the same time they said she left the park with the suspect.Phone records showed her last communication was with the suspect, Brown said. Her family and friends did not see or hear from her after that morning. Her sorority sister told CNN affiliate KSL that Lueck had also missed exams."She's extremely dedicated," Ashley Fine told the TV station. "She would never miss her midterms or anything like that. She hasn't been home. She didn't show up to work, or anything."A suspect is arrested After the suspect's arrest Friday, Brown contacted her parents to tell them the news. They were "devastated and heartbroken by this news," he said."This is one of the most difficult phone calls I've ever made," he said.The suspect lived about five miles from the park where Lueck was last seen.According to his LinkedIn page, he is a former information technology specialist for the US Army and recently worked for Dell and Goldman Sachs. CNN has reached out to the US Army and Dell for comment. 3686

Each year, an estimated 1 trillion plastic bags are consumed worldwide, with billions ending up as litter. In an effort to change those statistics, a college student is turning one of the world’s biggest wastes into a way to save lives for those living on the streets. “Me and my mom have lived through this," says Nataani Silversmith, who is homeless. "Sometimes our signs say 'blankets,' not even 'spare change.'”While blankets can help protect people from Mother Nature’s fury, there’s nothing as strong as a mother’s love for her child. “My life, I would give my life for my son,” says Nataani's mother, Lily Silversmith. When Lily saw her son cold and shivering on the streets of Salt Lake City, they had to find some way to keep dry and stay warm. “There were times when the cardboard would get soaking wet, but these would still be great, just fine, sturdy as can be,” Nataani says, pointing to a mattress made from recycled plastic bags. “And they would dry off in about an hour, rainstorm, no matter what.” Nataani is referring to Bags to Beds, a product from a pending non-profit that turns plastic grocery bags into sleeping mats.“They didn’t give us a dime and we didn’t ask for one. They gave it to us,” Nataani says about his experience with Bags to Beds. “Thank you, Bags to Beds. Thank you, thank you, thank you. Thank for saving me and my mom’s lives.”Bags to Beds started at the University of Utah campus, where a now medical student had the idea of turning plastic bags into beds. “I found out about how many people freeze to death in Salt Lake specifically every year; it’s over 100 people who freeze each year sleeping outside," says Kaitlin McLean, creator of Bags to Beds. "And I couldn’t wrap my head around that."McLean started this project as a way to reduce waste, while also finding a way to help the homeless. Already finishing and handing out more than 100 Bags to Beds, McLean’s hopes to have another 100 ready by this winter. “Our goal is to make it so these resources are so widely available," she says. "That if a person needs a bed they can get a bed and to also reduce waste to the point where we don’t have plastic bags in waterways and killing animals." 2204

China has reported 2,641 new virus cases as it escalates measures to contain the outbreak and reassure an anxious public.The figure is a major drop from the higher numbers in recent days since a broader diagnostic method was implemented. The number of new deaths rose slightly to 143, bringing the total fatalities in mainland China to 1,523. The number of confirmed cases in the country now stands at 66,492. Saturday marks the second day the number of new cases fell since a spike Thursday, when the hardest-hit Hubei province began including clinical diagnoses. People returning to Beijing were told to quarantine themselves for observation. And a team of experts led by the World Health Organization is due to begin its mission in China this weekend. 766

Earlier this year, Instagram head Adam Mosseri declared that the social network wants to "lead the fight against online bullying."On Wednesday, the social media platform announced a new effort in that daunting task: it's rolling out globally a feature called "Restrict," a tool it's been testing since July.When you "Restrict" another user, comments on your posts from that person are only visible to them, and not to other people. Restricted users also won't be able to see if you're active on Instagram at any given moment or if you've read their direct messages.Users can also opt to make a restricted person's comments show up for others by approving their comments."The fact that Instagram is doing something is better than nothing," said Randi Priluck, a professor and associate dean at Pace University focused on social media and mobile marketing. "But the question is: How much will this help?"Fifty-nine percent of US teens have been bullied or harassed online, 983

EVANS, Colo. — Ernesto Castro says he felt like he had a second chance at life after leaving the hospital where he spent days in a coma, hooked up to a ventilator, 176

来源：资阳报