Two gunmen shot dead at least 11 people on Sunday during a Jewish holiday celebration at Sydney’s Bondi Beach, Australian authorities said, declaring it a terrorist attack. One gunman was fatally shot by police and the second arrested.

The suspect was in critical condition, authorities said. At least 29 people were confirmed wounded, including two police officers, said Mal Lanyon, the police commissioner for New South Wales state, where Sydney is located.

The massacre followed a wave of antisemitic attacks that have roiled Australia over the past year, although the authorities didn't suggest those episodes and Sunday's mass shooting were connected. They said one of the gunmen was known to the security services.