An apartment building explosion was caused by a gas leak. The fire department said what's left of the structure will need to be demolished. An apartment building explosion Monday that rocked a westside Detroit community and injured a dozen people,

Fire investigators have confirmed that a gas leak caused the explosion at an apartment building on Detroit's west side Monday morning.

Investigators have determined a gas leak caused an explosion early Monday morning at an apartment building on the city's east side that injured 13 people, three of whom remained in critical condition on Tuesday.