Authorities release video in attempt to ID man who critically stabbed another passenger on transit bus in East L.A.

A 27-year old man who allegedly stabbed a passenger on a bus in East Los Angeles. in an incident that was caught on camera earlier this week has been arrested, officials announced Thursday, KTLA reports.

Manuel Ortiz was arrested early Thursday morning, Los Angeles County Sheriff Jim McDonnell tweeted. Ortiz is expected to be charged with attempted murder.

Ortiz was identified with help from the public, officials said. He was treated at a hospital for unknown reasons after the arrest.

via KTLA:

EAST LOS ANGELES, Calif. -- (KTLA) -- Officials have released surveillance video showing the moments before a man stabbed another passenger on a public transit bus in East Los Angeles in hopes of identifying the perpetrator.

The attack occurred, seemingly completely unprovoked, on Montebello Bus Lines' Route 10 around 10:15 a.m. Monday, the Los Angeles County Sheriff's Department said in a news release. The route travels largely down Whittier Boulevard, shuttling passengers between Whittier and Monterey Park.

While the bus was headed west in the 5700 block of Whittier Boulevard, one man suddenly pulled out a knife and stabbed another man several times in his upper torso, deputies said.

In the footage released Tuesday, the suspect can be seen riding the bus while standing in the center aisle, appearing calm until he pulls a blade from his pants and aggressively lunges toward another passenger.