FREMONT — Police distributed images Thursday from one of a half-dozen recent chain-snatch robberies in hopes the public can help identify suspects.

Concern over some of the robberies involving violence that injured victims was a factor in the decision, and authorities hope residents and visitors will raise their situational awareness.

Four images captured from a resident’s surveillance video camera show a woman being attacked and robbed of a chain at 1:40 p.m. May 8 in the 4100 block of Alder Avenue near Oliveira Elementary School.

The woman, who suffered bruises and scratches, was hurled to the ground by a suspect described as a black male in his 20s, 5-foot-8 to 5-foot-10 with a thin build, wearing a black baseball cap, gray hooded zip-up sweatshirt over a black shirt, light gray sweatpants and black-and-white “Jordan” Nike sneakers.

In a different robbery at 1:40 p.m. Wednesday, a woman pushing a baby stroller near Gibraltar Drive was walking an older child home from Patterson Elementary School, 33521 Cabrillo Drive, when a suspect approached.

The suspect pushed her to the ground and pulled a gold chain from her neck, injuring her in the process. A nearby crossing guard ran to help her.

The suspect then ran to a silver or gray four-door sedan that drove off at high speed. Police describe him as Latino in his early 20s, 5-foot-8 to 5-foot-11 with short black hair and a mustache, was wearing a dark green jacket and blue jeans.

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In a third robbery just before 4:40 p.m. May 6, an unidentified suspect approached a woman pumping gas in the 39900 block of Fremont Boulevard. When the suspect tried to pull a gold necklace off her neck, the woman tried to hold on, but he pulled her until she fell to the ground. He then hit her in the face, seriously injuring her.

Police said detectives were investigating the incident, using unreleased high-quality video footage of the incident from gas-station surveillance cameras.

Fewer consistent factors appear in the other chain-snatch robberies reported so far this month, police said.

In one reported at 10:20 a.m. May 4, a woman walking with her husband in the 32700 block of Lake Mead Drive had a chain ripped from her neck by a suspect described as a 6-foot white man about 30 to 35 years old with a medium build, wearing a white T-shirt, blue jeans and white cap.

Another robbery was reported at 6:10 p.m. May 7. A woman told police she was handling a sale through Facebook Messenger when a suspect robbed her of a gold chain after she answered her door at home in the 36600 block of Fremont Boulevard.

Just before 7:30 p.m. May 11, a woman reported a robbery just before after leaving a grocery store in the 39100 block of Argonaut Way. Police describe that robbery’s suspects as a dark-complexioned African-American man about 20 years old, 5-foot-7 with a thin build, wearing a black hoodie with a Nike logo across its front, faded light blue jeans and black high-top sneakers, and a dark-complexioned African-American woman about 20 years old, 5-foot-2 with a medium build, black hair in a high bun, wearing a black hoodie, faded blue jeans, tan shoes and carrying a multi-color backpack.

Officers reminded residents to conceal large amounts of money or expensive jewelry, limit use of cellphones or headphones while in public, remain watchful of observers near banks or other retail outlets, to park in well-lit spots when shopping at night, and to report suspicious people or vehicles, with descriptions if possible, by calling 510-790-6800 ext. 3 or by calling 911 for crimes in progress.

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Anyone with information is asked to call Fremont police Detective Brent Butcher at Bbutcher@fremont.gov or call 510-790-6900, text TIP FREMONTPD followed by a message to 888-777, or go to https://local.nixle.com/tip/alert/6216337.

Contact George Kelly at 408-859-5180.