Five men brutally attacked and robbed a Citi-Biker early this morning in Central Park and police believe the suspects are responsible for another robbery on Friday night, police sources said.

Jacob Angstreich, 47, was cruising through the park near 95th Street and East Drive around midnight Monday when he saw a group of young teenagers walking towards him.

“One of them intercepted me … as I was getting closer to him he told me to ‘get off the bike’ … and then he punched me and knocked me off the bike,” Angstreich recounted to The Post over the phone Monday afternoon.

“I fell off the bike and fell over a little fence onto the grass side of the road and he grabbed the bike and started to ride off … it was pretty scary, I was trying to size up what it was they wanted.”

Angstreich said his iPhone 7 fell out of his pocket and another one of the young men, who all looked to be about 15 or 16 years old, spotted it and snatched it up.

“He shouted to the others ‘I have an iPhone 7! I’m going to keep it!’ then he ran off.”

Angstreich started chasing the bike bandits on foot after they ditched the filched Citi Bike but couldn’t catch up.

Friday night, a Hunter College student told cops a similar tale.

Narish Singh, 21, was leaving the park around 11:30 p.m. when he realized he was being followed by 8-10 males and started speed walking to get away, law enforcement sources said.

One of the men asked Singh what kind of phone he had and another hit him in the back of the head causing him to fall to the ground, police sources said.

The men told him to “run his pockets,” which means to give them all he’s got. They also demanded his cell phone password.

Police sources said the suspects also told the Citi Biker to “run his pockets,” leading them to believe the incidents could be related.