Police are urging residents working while they are at coffee shops to sit far from exits and be aware of their surroundings after thieves stole laptops at two different Starbucks shops in Foster City on Sunday and Monday.

The Foster City Police Department also suggested in a news release that customers wearing earphones only wear one of the two earbuds so they could be aware of what’s going on around them. The department also suggested customers don’t sit with their backs to open spaces or parking spots, and never leave their possession unattended.

One customer had his laptop stolen at about 1:30 pm on Sunday, Aug.4, while working at a Starbucks on Alma Lane, the department said in its news release. A suspect grabbed the laptop from in front of the victim and ran outside, where witnesses said he met up with a another accomplice. Both individuals, described as African American males with slim builds in their late teens or early 20s and wearing hoodies, got into a black Nissan Versa being driven by a third individual.

The next day, on August 5, a customer at a Metro Center Boulevard likewise had his laptop snatched while he was working by a suspect wearing a red and green bandanna on his head. He was joined by two other suspects wearing hoodies. All three were described as African American men with slim builds in their late teens or early 20s.

Foster City police officers searched the areas after both incident but were unable to locate them, according to the news release.

Late last month customers tackled suspects stealing a pair of laptops at Romeo’s Coffee on Telegraph Avenue, in Berkeley, KTVU reported. The shop owner told the TV station he thought the door — which customer leaving have to pull in rather than push out — provided the sufficient delay for the customers to stop the would-be thieves.