A gunman opened fire at a group inside a bucolic Brooklyn park early Saturday, killing one man, police and witnesses said. Cops took one person in for questioning following the 2:45 a.m. shooting inside Carroll Park, officials said. The unidentified victim, who is believed to be in his 20s, was in the park on President St. near Smith St. in Carroll Gardens — hanging out by some benches with a group of friends — when the suspect pulled a gun and opened fire. The victim was struck once in the torso. The gunman was targeting the group when the shooting occurred, witnesses said. A video reviewed by the Daily News shows responding officers performing CPR on the victim as an ambulance arrives. A few feet away, additional officers had a possible suspect in custody. Theodore Parisienne / New York Daily NewsSome blood could be seen inside the park after an adult male was pronounced dead at Methodist Hospital after he was shot in the torso. (Theodore Parisienne / New York Daily News) EMS rushed the victim to New York-Presbyterian Brooklyn Methodist Hospital, but he couldn’t be saved. Cops were trying to confirm his identity. On Saturday morning cops were scouring the bucolic block-long park, looking for additional evidence and surveillance videos that can help them understand what happened. While neighbors said it’s common for people to be in the small park at night, they were surprised by the violence. Carroll Park, one of the oldest parks in the city, is surrounded by $3 million brownstones in what’s considered one of the safest communities in the city. There were no homicides in the 76th Precinct, which covers Carroll Gardens all last year. Only one took place in 2023. Shootings had also dropped last year, from 11 to 4, cops said. Yet felony assaults skyrocketed by 16% in the area, from 104 in 2023 to 121 as of Dec. 29, cops said. Criminal charges against the man in custody were pending Saturday.