A pair of thieves have stolen cellphones from at least 22 people Downtown since the beginning of August, police said. View Full Caption Shutterstock

CHICAGO — A pair of thieves have stolen cellphones from at least 22 people Downtown since the beginning of August, police said.

In the incidents, the thief or thieves walk up to a victim from behind, grabbed the victim's cellphone and then ran away or rode off on a bicycle, according to a Chicago Police community alert. During four of the incidents, the thieves got away in a white Cadillac.

The thefts occurred:

• The morning of Aug. 6 in the first block of East Hubbard Street

• The evening of Aug. 6 in the 300 block of East Illinois Street

• The afternoon of Aug. 6 in the 300 block of East Illinois Street

• The afternoon of Aug. 7 in the 600 block of North Michigan Avenue

• The afternoon of Aug. 9 in the 900 block of North Wells Street

• The morning of Aug. 10 in the 400 block of North Orleans Street

• The afternoon of Aug. 10 in the 200 block of East Ohio Street

• The afternoon of Aug. 10 in the 100 block of East Grand Avenue

• The afternoon of Aug. 10 in the 200 block of East Delaware Place

• The afternoon of Aug. 11 in the 200 block of West Kinzie Street

• The afternoon of Aug. 11 in the 600 block of North Lake Shore Drive

• The morning of Aug. 12 in the first block of East Chicago Avenue

• The afternoon of Aug. 14 in the 500 block of North State Street

• The afternoon of Aug. 14 in the 200 block of East Illinois Street

• The morning of Aug. 18 in the 400 block of North Clark Street

• The morning of Aug. 21 in the first block of West Schiller Street

• The morning of Aug. 30 in the first block of East Illinois Street

• The evening of Sept. 6 in the first block of East Ontario Street

• The evening of Sept. 6 int he first block of West Hubbard Street

• The evening of Sept. 7 in the 400 block of North Wabash Avenue

• Evening of Sept. 18 in the 400 block of North Michigan Avenue

One thief was described as a 15- to 20-year-old boy or man who was black, 5-foot-10 to 6 feet and 130-150 pounds with dreadlocks, police said. The other thief was described as an 18- to 24-year-old man.

Anyone with information about the thefts was asked to call police at 312-747-8380.