A San Francisco teenager was arrested Monday on suspicion of “brutally assaulting” an 18-year-old in Moss Beach, the San Mateo Sheriff’s Office said. Officials said deputies responded to a reported assault on the 100 block of Barranca Lane in Moss Beach around 2:15 a.

A 17-year-old San Francisco boy was arrested Monday after allegedly beating a young man with a blunt object at a Moss Beach home, according to authorities.

The assault occurred around 2:15 a.m. in the 100 block of Barranca Lane, where San Mateo County sheriff’s deputies found an 18-year-old with severe injuries to his face and head. Investigators said a girl was in her room when an acquaintance jumped through her open window,

A 17-year-old San Francisco boy was arrested on suspicion of chasing an 18-year-old man into a home and brutally beating him Monday in Moss Beach, according to authorities. The incident unfolded around 2:15 a.