SAN DIEGO (CNS) - A brush fire alongside Interstate 8 in the College area slowed rush-hour traffic on the busy freeway late Tuesday afternoon and temporarily shut down a nearby stretch of trolley tracks.

Patches of foliage and several palm trees began burning near Alvarado Road about 4:30 p.m., according to the San Diego Fire-Rescue Department.

Ground crews and personnel aboard a water-dropping helicopter had the flames under control within about a half-hour. No structural damage or injuries were reported.

The blaze forced the suspension of light-rail service between San Diego State University and Alvarado Transit Station into the early evening, according to the Metropolitan Transit System, which provided bus service for the affected commuters.

The cause of the fire was under investigation.