At left, surveillance photos of a man suspected of raping a woman at knife-point in her Washington Heights apartment building. At right, a sketch of a suspect wanted for an assault in Inwood Hill Park Friday night.

Three sexual assaults in as many days in northern Manhattan—one a block from the 34th Precinct station house—have residents of Washington Heights and Inwood alarmed. Investigators don't believe the three attacks were connected, and have released a police sketch and surveillance photos in the hunt for perpetrators in the first two incidents. The first took place in Inwood Hill Park around 10:40 p.m. Friday, when a shirtless Hispanic man in khaki shorts and a blue medallion around his neck struck up a brief conversation with his 28-year-old Hispanic victim.

Police say the suspect, described as being 30 to 35 years-old and about 5-foot-7 to 5-foot-9 and 175 lbs, forced the woman into a secluded area of the park and sexually assaulted her, then fled on a red mountain bike. The second assault in the area occurred hours later, around 2:15 a.m., when a Hispanic man, seen in the surveillance photo here, confronted a woman on the fifth floor of an undisclosed Washington Heights apartment building, then sexually assaulted her at knife-point on the eighth floor. The suspect wore a black T-shirt and black sweatpants, is between 20 to 25 years-old and stands about 5-foot-3 to 5-foot-5. Both victims were treated at area hospitals and released, the Daily News reports.

The third assault happened this morning on 184th Street and Bennett Avenue, a block from the 34th Precinct station house, when a man tried to tear off a woman's clothes in the middle of the street. Police tell NY1 he fled to the nearby A subway line. The perpetrator is described as a 20- to 25-five year-old Hispanic male.

In the wake of the assaults, concerned volunteers have passed out over 1,000 fliers warning residents to be on the lookout for the suspects. City Council Member Robert Jackson and other other community leaders are asking the NYPD to make permanent the 20 officers temporarily deployed to the precinct. “The recent string of sexual assaults against women has shaken our community to the core and reminded us that we can’t let up in our fight against crime, particularly when it comes to protecting women and families,” said State Senator Adriano Espaillat told the Manhattan Times. And at a press conference, community leader Maria Luna called on residents to not let fear keep them out of the parks, because there's safety in numbers.