WILMINGTON, Del. — Authorities are continuing their investigation into a rowhouse fire that left two Wilmington firefighters dead and two others critically injured.

Wilmington Fire Chief Anthony Goode said Monday that the Delaware Fire Marshal’s Office and the Bureau of Alcohol, Tobacco, Firearms and Explosives are investigating the fire, which broke out around 3:15 a.m. Saturday.

While Goode released few details and did not take questions, he said officials are aware of recent vehicle fires in the area but do not know if there’s any connection to the house fire.

The floor of the home collapsed as firefighters went inside, and four firefighters were trapped in the basement.

Forty-one-year-old Lt. Christopher Leach and 51-year-old Senior Firefighter Jerry Fickes died.