A pair of armed carjackers stole a semi-truck from a driver in the middle of a car chase in the San Fernando Valley on Sunday.

The chase began in Lancaster after law enforcement received a call of a carjacking at gunpoint. Two people took off from the scene in a stolen truck and led officers on a pursuit toward Santa Clarita.

At some point, the assailants traveled on the wrong side of the 5 Freeway and stopped on the side. While halted, they approached a parked semi-truck and forced the driver out of the vehicle.

Officers have since been chasing the two individuals in the semi-truck.

This is a developing story, please check back for updates.