At least 20 Palestinians were killed in an Israeli air strike that hit a popular seafront cafe frequently used by activists, journalists, and local residents in western Gaza City on Monday, according to medics and eyewitnesses.

The cafe, one of the few businesses to continue operating during the 20-month war, was a gathering spot for residents seeking internet access and a place to charge their phones.

More than 40 people have been killed in an Israeli airstrike that hit a cafe near the port in Gaza City, according to the head of the territory’s largest hospital.