After two armed robberies at Jamaica Pond on Sept. 24, the Boston Police Department is warning residents to be alert for further crimes by the gun- and knife-wielding suspects.

The robberies happened in the 11 p.m. hour on the footpath around the pond. The suspects are described as two black Hispanic men in their early 20s.

BPD did not explain why it waited nearly a week to alert the community about the violent crimes. BPD issued the alert only after a Gazette inquiry in response to emails from local crime watch groups. BPD did not directly respond to Gazette questions.

The first robbery, around 11 p.m., involved the suspects robbing a group of people. One suspect displayed a black firearm, while the other displayed a knife, according to BPD.

The second robbery, around 11:25 p.m., targeted a man who was walking on the path with his bicycle. The suspects forced the man into a wooded area, robbed him, and left him tied to a tree, according to BPD. Anastasia Lyman of Jamaica Plain’s Greenough Street area crime watch circulated an email reportedly quoting an acquaintance of the victim as saying the robbers also placed a bag over his head and forced him to divulge “passwords.”

Anyone with information about the crimes can contact detectives at JP’s District E-13 Police Station at 617-343-5628 or anonymously by calling 1-800-494-8477 or by texting the word “TIP” to 27463.

The District E-13 Community Service Office recently issued these tips for reducing your risk of being targeted by robbers: