Milwaukee police are investigating the second carjacking of a mail delivery truck, just hours after the first.

Authorities said a UPS driver was carjacked in the 2000 block of North 36th Street just before 7 p.m. Thursday.

Investigators said two suspects walked up to the victim, pointed a gun at him, stole his wallet and the truck's keys. One suspect ran on foot, while the other took off in the UPS truck.

Officers said the vehicle was later found empty in the 3700 block of Sarnow. UPS told CBS 58 that the 54-year-old victim is okay.

A long-time resident of the neighborhood gave us his reason for the rash of crimes.

"It hurts me because I was a kid out here and we did different things then what they do now," said Tom Austin. "That's basically what I'm saying. We did different things. We had something to do. They have nothing to do. So, basically I'm saying they're losing hope in the neighborhood. They're losing hope."

Surveillance video shows a brazen criminal carjacking a postal worker at 57th and Burleigh on Wednesday afternoon.

He forces his way into the mail van and pushes the woman out. She wasn't hurt.

Officers found the vehicle, but the suspect got away with packages and letters.

Milwaukee police have made no arrests in either case.

UPS will notify you if packages have been stolen, but recipients must go to www.ups.com and put in their tracking number to find out.

CBS 58 reached out to the U.S. Postal Service Friday to see how its alerting customers of stolen mail, but have yet to receive a response.