At least 32 people were shot over the weekend, including a man killed along the Chicago River on the Northwest Side and a 13-year-old boy wounded while riding his bike in Little Village on the West Side, according to police.



Between Friday afternoon and early Monday, at least four people were killed and 28 others wounded, police said.



The man killed along the Chicago River was found around 12:15 a.m. Sunday on a sidewalk in the 5000 block of North Bernard Street in the North Park neighborhood, police said.



In another Northwest Side area, the boy was shot in the arm about 2:40 p.m. Saturday in the 2500 block of South St. Louis Avenue when a gunman got out of a light-colored vehicle and fired, police said. He was taken by ambulance to Stroger Hospital, where he was listed in good condition, police said.



The weekend violence brings to at least 2,877 the number of people shot in Chicago this year, down about 400 from this time last year. There have been at least 527 homicides, about 50 fewer than this time last year, when gun violence hit levels not seen in two decades, according to data kept by the Tribune.



Shootings and homicides remain much higher than other recent years, according to the data.



Over the weekend, the Chicago Police Department announced it is increasing its crime-fighting technology, including expanding its gunshot detection software into six more patrol districts.