New York City’s mayor says preliminary evidence suggests a gas-related explosion is to blame for a fire and building collapse in Manhattan.

Mayor Bill de Blasio says the initial impact appears to have been caused by plumbing and gas work inside one building, which then partially collapsed in a fire and blast that ultimately affected four buildings near New York University and Washington Square Park.

At least a dozen people were injured Thursday. The mayor says his thoughts and prayers are with every one of them and their families.

(AP)