Somerville's Fire Investigation Unit is investigating the cause of a Sunday morning truck fire on Lower Broadway in East Somerville.

According to an announcement from Deputy Chief Charles Breen of the Somerville Fire Department, firefighters responded to Broadway Brake Company at 45 Broadway at 4:37 a.m., where there was a parked truck "fully engulfed" in flames.

The truck was parked close to the building, and the fire had spread to a nearby trash container, the announcement says.

Firefighters managed to put the truck fire out before it spread to the building, according to the announcement, though the building did suffer some minor damage.

It was a busy weekend on Lower Broadway, according to the announcement.

On Saturday morning, at about 5:30 a.m., firefighters responded to a fire in an apartment at 16 Broadway, above Mount Vernon Restaurant.

The fire likely started in a waste basket and spread to a wall and cabinets, the announcement says. The sprinkler system controlled the fire, and firefighters had to open up a wall to make sure it hadn't spread further.

The fire department believes it was stared by "careless disposal of smoking materials," according to the announcement. No one was at home during the fire, and it caused about $15,000 worth of damage, the announcement says.