Six people were injured Saturday morning when a Christmas tree caused a fire at a home in west suburban Lisle. Firefighters responded at 8:44 a.m. after a passerby reported the fire at the two-story home in the 4700 block of Dumoulin Avenue, according to a statement from the Lisle-Woodridge Fire District. The first responding unit reported heavy fire coming from the home’s first and second floors. A resident then told firefighters that everyone had cleared out of the home, and the blaze was struck out within 45 minutes, the fire district said.