For the fourth time in two weeks, a gunman robbed a fast-food restaurant on Oahu.

Police are still looking for a suspect or suspects in the robberies. They have not said if the robberies are related.

This time, the armed robber held up the Wendy’s restaurant at 630 Puuloa Road at 1:30 a.m. Thursday and got away with an undisclosed amount of money.

On Wednesday, a man, who covered his face with an orange bandana, held up the Royal Kunia Wendy’s using a shotgun at about 7:45 a.m..

On Monday, a man with a rifle robbed the McDonald’s in Aiea near Pearl Kai Shopping Center on Kamehameha Highway at about 4:30 a.m.

On July 14, at about 4:40 a.m, a gunman held up a Jack In The Box on Farrington Highway in Waipahu.

The fast-food robberies are part of a series of business robberies in the past month including:

>> On Tuesday at about 4:15 p.m., an armed man entered a Waipahu business demanding money, and ran off with cash.

>> On July 12 at about 9:45 p.m, a man brandishing a weapon robbed a business in Pearl City.

>> On July 10 at about 3:40 a.m., two armed men robbed the Longs Drugs at Waipahu Town Center on Farrington Highway.

>> On June 30, a man with a handgun robbed the Longs Drugs in Manoa Marketplace just before closing at midnight.

>> Also on June 30, at about 9:30 p.m., a man with a handgun robbed an ABC Superette on Ala Moana Boulevard in Waikiki.