Report reaching us says, United Parcel Service (UPS) employee has shot and killed three people before turning the gun on himself at a San Francisco depot, United States.
UPS spokesman Steve Gaut said, "an employee opened fire on colleagues before drivers were sent out for deliveries."
The suspect shot himself when confronted by police and later died in hospital, BBC reported.
Police said the building was secure but did not offer details on the victims.
San Francisco assistant police chief Toney Chaplin said the suspected gunman was armed with an assault pistol and shot himself as he was confronted by police.
"UPS confirms there was an incident involving employees within the company's facility in San Francisco earlier in the morning."
"We cannot provide information as to the identity of persons involved at this time, pending the police investigation," official of the UPS said.