on camera. a chinese fighter jet comes within 400 feet of a u.s. air force plane. our richard engel s dangerous assignment inside an african nation pracactically rurun by a russian mercenary group. how it s fueling the war in ukraine mystery solved why the famed venice canal suddenly turned green. and a major comeback for the pitcher diagnosed with cancer just five months ago announcer: this is nbc nightly news with lester holt and good evening i m tom llamas in for lester there is fear and outrage in iowa tonight as desperate families cling to hope that their loved ones may still be alive inside a partially collapsed apartment building in the city of davenport look at these images part of the building is totally gone, but then there was this amazing scene last night. a resident waving for help some 27 hours after the collapse not only that, it came after authorities said that first responders had checked the entire building and no one was left inside. in fact, th