The Bureau of Alcohol, Tobacco, Firearms, and Explosives is investigating an 18-year-old man who was arrested in connection with two convenience store robberies and a car jacking on Oahu.

The man was arrested for two robberies at 1:50 p.m. Thursday on Pakini Street in Aliamanu. Police said today he was transferred to federal custody and the case was being handled by the ATF. It was not clear why the ATF took over the case.

Honolulu police said the man was involved in the armed robberies of two 7-Eleven stores in Salt Lake and Moanalua.

A surveillance video released by police showed the man entering the store at 4805 Bougainville Drive about 1:20 a.m. Sunday carrying a knife.

Police said he demanded money from an employee and fled with an undisclosed amount of cash in a late model maroon Chrysler PT cruiser.

Officers also arrested the man in connection with an armed robbery case five months ago.

Police said two masked suspects entered the convenience store in Moanalua at about 3:05 a.m. on Aug. 11, 2019.

Surveillance video showed one of the two culprits enter the store holding a firearm and the second one jumping over a counter.

Both suspects fled the scene with boxes of cigarettes and money taken from the register.

Police also said the man approached a 21-year-old man sitting in the driver seat of his car about 8:20 p.m. Monday. The man wielded a kitchen knife and ordered the victim out of his car, police said. The victim complied and the man drove off with the car, police said.

He was later identified in a police lineup.