Toronto police have released a sketch of a suspect wanted after a weekend fire tore through a downtown townhouse in what the Fire Marshall’s Office is now calling an arson.

Two firefighters were seriously injured in the three-alarm fire that broke out at 85 Shuter St., near Jarvis St., at about 2 a.m. Saturday.

A man was spotted leaving the townhouse as first responders arrived, police said in a news release Thursday.

Firefighters were on the roof trying to control the fire, and Jim Warren and Terry Leimonis were injured after falling from the crumbling ceiling.

In an email sent Tuesday to Toronto Professional Fire Fighters’ Association members, union president Frank Ramagnano said Warren remains in intensive care at St. Michael’s Hospital and slowly “making improvements every day.”

Warren, a 36-year veteran of the fire service, will “hopefully move to a recovery room within the next week as his condition improves and beds become available,” Ramagnano said.

“His breathing has greatly improved, and he is talking. At one point today they had him standing up for a few minutes.”

Leimonis was released from hospital while his leg continues to heal, Ramagnano said.