Australian police said on Monday that they expected to bring criminal charges against the gunman hospitalized after a shooting spree in which 15 people were killed, in one of the deadliest attacks on the Jewish community in the nation’s history.

The authorities said they found evidence that the attack on Sunday at the city’s famed Bondi Beach, which they said was carried out by a father and son, was an act of terrorism targeting Sydney’s Jewish community during a Hanukkah celebration. But they declined to provide additional details, including the suspects’ ideology or exact motive.The 50-year-old suspect arrived in Australia in 1998 on a student visa, the home affairs minister said. In 2001, he transferred that to a partner visa and after trips overseas, has been on resident return visas three times.

The younger suspect first came to the attention of Australian officials in October 2019, “on the basis of being associated with others, and the assessment was made that there was no indication of any ongoing threat or threat of him engaging in violence,” Australia’s prime minister said at a news conference on Monday.