ALAMEDA -- An OnStar security tracking device helped Alameda investigators locate an SUV stolen at gunpoint Tuesday night when its signal led them into Oakland, where they found the vehicle abandoned.

The carjacking occurred about 9:30 p.m. in the 900 block of Regent Street, while the 73-year-old victim was parking the gray 2013 Chevrolet Equinox after dropping off his wife on nearby Otis Drive.

The man, who lives in Fairfield and was visiting family in Alameda, told police that two suspects confronted him, including one armed with what appeared to be a revolver, Alameda police Sgt. Mark Reynolds said.

The victim was not hurt and could not provide a detailed description of the men, saying both were between 18 and 21 years old.

An OnStar device is fitted into a vehicle and uses GPS and other technology to provide police with its direction, speed and location in the event that the vehicle is stolen. The vehicle owner can also use the device to get help after an accident or another emergency.

Shortly after the Chevrolet was stolen in Alameda, its tracking device showed the SUV was in Oakland near the In-N-Out Burger on Hegenberger Road before the signal showed that it was on 35th Avenue.

As Alameda police were traveling to 35th Avenue, however, an Oakland officer spotted the Chevrolet parked and unoccupied in the 3500 block of Quigley Street, Reynolds said.

The carjacking on Regent Street came on the same day as two men tried to rob the California Check Cashing store at 1602 Webster St.

The men approached an employee about 8:25 a.m. as she was standing outside at the front door, opening the business, and one placed an object that may have been a handgun against her back, police said.

After forcing their way into the business, the men demanded the woman open an interior security door that would have allowed them access behind the counter. They fled when the woman told them that she could not open the door.

Both suspects were wearing hoodies and are described as black men between 20 and 25 years old. One was tall with a heavy build and one was shorter with a thin build.

The men were last running southbound on Webster Street.

The attempted robbery of the check cashing business follows a robbery Thursday night at the Nob Hill Foods store at the Bridgeside Shopping Center on Blanding Avenue.

Workers had just closed the business when the suspect knocked on the glass doors about 11:30 p.m., telling an employee who went to investigate that he had accidently left an item inside the restroom and that he needed to get back inside to retrieve it.

The suspect was wearing a motorcycle helmet, black gloves and all-dark riding gear, police said. He also may have been wearing a mask under the helmet.

When the employee refused to open the door, the man brandished a handgun. He then entered the business and ordered the employee to open the safe.

At least one other worker, who was polishing a floor, was inside the store during the robbery, police said. No one was hurt and the suspect made off with an undisclosed amount of cash.

Alameda police ask anyone with information on any recent cases to call 510-337-8340.

Reach Peter Hegarty at 510-748-1654 or follow him on Twitter.com/Peter_Hegarty.