Police are looking for a gun-toting suspect believed to be responsible for a string of crimes Thursday night including an attempted carjacking at a store in Jefferson Township and a robbery at a store in Buffalo Township.

The unknown man threatened two people with a handgun but no one was injured, authorities said.

State and local police spent the night processing three crime scenes, interviewing witnesses, reviewing surveillance video and looking for the gunman, a white man between 20 and 30 years old, about 5 feet, 8 inches tall with a thin build.

Investigators had no immediate suspects.

The long night for law enforcement began at 6:39 p.m. when state police were called to the BP/Fueland store on Dinnerbell Road, across from Knoch High School, in Jefferson Township.

A 44-year-old Sarver woman told police that she had driven to the store and used the automated teller machine. When she returned to her Jeep Patriot, police said, a man was inside.

“She was backing up when a guy reached around from the back seat,” said Trooper Adam Peth. “He put a gun to her rib area and told her to start driving or he was going to shoot.”

Defiant, the woman refused, put the vehicle in park and jumped out. Thinking quickly, she took the vehicle’s keys with her before leaving — a move that earned praise from police.

Just minutes after getting there, troopers got another call, at 6:50 p.m., for a reported theft of a vehicle — a 1997 Jeep Cherokee — from a mobile home park on Driftwood Drive in Jefferson Township near the Fueland store.

Minutes later, the BP/Fueland store on Ekastown Road in Buffalo Township was robbed at gunpoint, police said.

Buffalo Township police were called about 8 p.m. and learned that a man wearing a dark ski mask, dark gloves and other dark clothing had walked into the store brandishing a handgun.