Early Monday morning, around 5 a.m., a 24-year-old man was walking the 3300 block of North Halsted Street when four men attacked him, police News Affairs Officer Robert Perez told the Sun-Times.
Another man was attacked shortly after in nearly the same location.
Then, late Monday, around 11 p.m., a different man was walking his bike to his car near the Peggy Notebaert Nature Museum around the intersection of Fullerton and Cannon Drive when he was jumped by three men. He fought them off with his bike lock and threw $137 cash on the ground. The attackers snatched the money and fled.
"This lock was my saving grace, really," the victim told the Tribune.
The victims in the previous attacks have all been men in their 20s who were alone in the early morning hours, according to ABC 7. Police believe the same attackers-- a group of three or four men-- are responsible for many, if not all, of the incidents.
Police have stepped up patrols in the area but have no suspects in custody. They are urging residents to travel in groups at night and to avoid vacant lots or dark alleys.
Police urge anyone with information on the robberies to call 911 or Belmont Area detectives at (312) 744-8263.
CBS 2 put together this map of where the robberies have occurred:
View Lincoln Park Attacks in a larger map