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Because the collapsed wreckage was a complex mix of various construction materials, including metal beams and steel and concrete slabs, the work was difficult.

Beijing supplied a total of 721 hectares of construction land for residential housing last year. In April 2017, the city announced plans to supply 6,000 hectares of land by 2021 in a bid to meet the market demand of residential houses.

Before Tiankun, the largest cutter-suction dredger in Asia was Tianjin Dredging Co's Tianjing, which was designed by Chinese and German engineers. It can handle 4,500 cubic meters of material each hour from 30 meters under the surface.

Beijing plans to complete the renovation of household garbage sites by the end of this year, authorities announced at a news conference on Thursday.

Before the US agrees to a withdrawal, it is demanding the Taliban put in place security guarantees, a cease-fire and other commitments.