The South Slope sex fiend has struck yet again.
A creep groped a woman near Fourth and Prospect avenues on Wednesday night in the 11th shocking attack since March — a day after cops tried to convince exasperated locals that they’re doing all they can to nab the suspect.
In the latest incident, the brute groped a 29-year-old woman at 9:05 pm, when she exited the Prospect Avenue R train station. The victim told cops that the monster sneaked up from behind, grabbed her breasts and fled after she screamed.
Police describe the suspect as a thin 5-foot-7 man, 19- to 24-years-old and weighing about 150 pounds. He was last seen wearing a black T-shirt, baggy dark jeans and a black baseball cap.
“The victim’s description fits with the pattern of attempted assaults,” said a police source. “And it’s typical with the other incidents. She was grabbed from behind by surprise.”
The sex fiend — or fiends — has terrorized South Slope, Bay Ridge, Sunset Park and Park Slope for months, raping one woman and attempting to assault 10 others.
The ensuing fear and loathing prompted residents and local pols to hold rallies in the streets, organize self-defense classes and circulate “Wanted” posters alongside cops, who boosted their patrols in late August after the fifth attack in the neighborhood.
But residents say cops haven’t always been proactive.
Earlier this month, a Kensington woman told The Brooklyn Paper that she called Crime Stoppers after a man who looked like the South Slope suspect flashed her on the subway, but an officer hung up on her.
And a Park Slope woman who was attacked on Sept. 8 near 12th Street and Eighth Avenue said police never showed up after her neighbors dialed for help.
Adding to local frustration are three different police sketches for at least two suspects.
Police originally sought only one South Slope sicko following the first incident on March 20. The suspect — described as 5-foot-7 and 165 pounds — attacked a 24-year-old woman at 11:30 pm on 16th Street near Fourth Avenue.
Following a series of attempted rapes over the summer, detectives released a second sketch of the same suspect.
Cops recently began circulating a third police sketch for a Sept. 4 incident, when a sicko attacked a woman near 49th Street in Sunset Park at 3:40 am. She fought him off.
It was only after two attacks in Park Slope on Sept. 8 and Sept. 9 that cops announced there was more than one fiend on the loose.
Deputy Inspector Raul Pintos, commanding officer of the 72nd Precinct, updated residents on Tuesday about the police response — which includes night patrols by auxiliary cops, undercover agents and officers from other precincts.
Still, many residents aren’t convinced that it’s enough.
“This is like theater,” said South Slope resident Alexandra Benavente. “Police come here and tell us they’ve increased the police presence, but we never see them around at night.”
One local critic, Bo Samajopoulos, agreed.
“Cops need to stop handing out flyers and leave that to volunteers, stop making appearances for the press and get out of their cars and into the neighborhood,” he said.
Pintos defended the police effort, saying he’s been actively working with neighborhood watch groups and sending them e-mail updates on each attack.
“From the very beginning, every single sexual assault has gotten the attention it deserves,” he said.
Anyone with information on the South Slope rapists is asked to call Brooklyn Special Victims Squad at (718) 230-4415, not Crime Stoppers.