Three teens have been charged with armed robbery after knife-wielding males held up two servos on the coast over the weekend.

Police are investigating two separate incidents at service stations in Wyong and Lake Munmorah. In both cases, it is alleged a man armed with a knife threatened the attendant.

On Sunday three males entered the 7-Eleven on the Pacific Highway in Wyong about 3am.

It is alleged one man was armed with a knife and the trio approached the attendant, who then retreated to a back room.

They then left with some cigarettes and other goods, but no cash.

The three males, an 18-year-old and two 17-year-olds all from western Sydney, were arrested a short time later in a nearby motel.

They had bail refused and appeared in Wyong Local Court on Monday charged with armed robbery.

Police are appealing for witnesses to the two servo hold-ups.

The previous morning at 1.45am a man brandishing a knife ran into the BP service station on the Pacific Highway and confronted the store attendant.

The staff member activated the holdup alarm and the man fled empty-handed. He was last seen running north along the Pacific Highway.

The man was described as caucasian, 150cm, overweight and wearing a black hooded top and black tracksuit pants.

“The incidents are not linked, and we have apprehended three males in relation to the Wyong robbery,” Tuggerah Lakes Duty Officer Chief Inspector Rod Peet said.

“We would like to speak to anyone with information regarding both incidents, and are still investigation the Lake Munmorah attempted robbery,” he added.

No-one was hurt in either incident.

Extracted in full from the Daily Telegraph.