At least 13 people were killed and an estimated 37 others are still missing in the small town in Quebec where a runaway train exploded Saturday, Canadian police said at a news conference on Monday. The unmanned train was carrying 72 tankers of crude oil when it plowed into the heart of Lac-Megantic, Quebec, on Saturday. The crash and a series of explosions flattened 40 buildings and forced nearly 2,000 people to evacuate the town, 130 miles east of Montreal. More than 1,500 of those evacuated will be allowed to return to their homes Tuesday, officials were quoted as saying by CNN.