The Belmont Police Department said San Juan Canyon from East Laurel Creek Road to Cipriani Boulevard is under evacuation.
Ovelio Ramos, 56, is suspected of trying to contact a minor six times to have sex.
Jovhon Stewart had been convicted in February of second-degree murder for the killing of Dejohn Jones, 24, who was shot early on the morning of Aug. 5, 2017, at Jones' ex-girlfriend's apartment on Ralston Avenue, according to the district attorney's office.
A train engineer discovered the body around 5:55 a.m. next to the tracks in the area of Ralston Avenue.
Video provided to KTVU by Belmont resident Tom Lewis.
A caller notified police about 4:30 a.m. after seeing two males rummaging through parked vehicles in the 800 block of El Camino Real.