The 900 block of W. Hollyvale Street was evacuated around 3:20 p.m. According to authorities, a warrant was served at a home in the neighborhood, when police found a "large amount of illegal fireworks."
The Los Angeles Sheriff's Department's Bomb Squad is on the scene.
"One person was spotted being taken into custody from the scene. As of Monday night, it is unknown if that person being taken into custody had anything to do with the fireworks being confiscated."
Azusa Police estimate that the area will be closed for at least five hours. Anyone displaced by the evacuation center will be able to stay at the cooling center at Memorial Park until the evacuation order is lifted.