SAN ANTONIO -

A man was critically injured overnight after an attack by two men who wanted his backpack.

Police say the man walked home from a bus stop around midnight Sunday in the 5400 block of Evers Rd.

They say two men attacked him and tried to steal his backpack.

Police say the victim tried to defend himself, but one of the suspects pulled out a knife and stabbed him several times.

A security guard walking around the parking lot saw the victim collapse and called for help.

EMS took the man to University Hospital in critical condition.

Police are searching for his attackers.