The NYPD is searching for two men they say committed a string of robberies in Greenpoint early last Sunday morning.

In the first incident, at 3:10 a.m., cops say a 26-year-old male victim was skateboarding with some friends on the northeast corner of Jackson Street and Meeker Avenue. He was approached by four unidentified males, who tried to talk to them; one of the men grabbed the victim and forced him to the ground, while another stole his backpack. A third suspect hit the victim in the back with his skateboard, before all four fled eastbound on Jackson Street. The victim says the suspects made off with a $100 Pentax camera, an iPhone 6, his identification and passport, and three books ("Just Kids", "Philosophy of Andy Warhol" and "Lolita"). He refused medical attention.

A little over an hour later, at 4:15 a.m., a 35-year-old man was approached by three men he didn't know, while walking near Jewel Street and Meserole Avenue. One man allegedly hit the victim in the face with some sort of object, while the other two stole his iPhone, wallet, ID and MetroCard, along with $300 in cash. They fled the scene, and the victim was given stitches to fix a laceration on his chin at Wyckoff Medical Center.

Fifteen minutes later, at 4:30 a.m., a 32-year-old man says he was headed south on Diamond Street at Meserole Avenue when two men came up to him from behind—one punched him in the face, and he fell to the ground. The two men then allegedly went through his pockets and stole his Samsung Galaxy 7, and his wallet, which contained $80, an ID, and an assortment of bank cards. They then fled the scene, according to police.

And at 4:45 a.m., a 33-year-old man says he was walking south on Leonard Street at Engert Avenue when two men, one of whom was carrying a skateboard, came up to him and asked for the time. Then, the victim says one of the men held him at knifepoint and asked him to hand over his property. The men took off with the victim's iPhone 6 and American Express credit card.

Photos of at least two of the suspects are above.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577.