Australian police are investigating a trip taken to the Philippines by two alleged gunmen in the month before Sunday's deadly shooting.

A Holocaust survivor, a 10-year-old and a Chabad rabbi were among the 15 people killed when two gunmen opened fire on a Hanukkah event at Australia's Bondi Beach on Sunday. Hundreds of people had gathered to mark the first day of the Jewish festival before the attackers struck at the event in Sydney.

Australian Prime Minister Anthony Albanese has called an attack on a Hanukkah celebration at a Sydney beach that killed at least 11 people an act of antisemitism and terrorism.

The spread of violence against Jews is intertwined with the social acceptability of violent rhetoric directed at Jews’

A troubling rise in antisemitic attacks and incidents in recent years have left some feeling anger after the kind of deadly attack they felt was sure to happen.

At least 11 people were killed at a Jewish gathering on Australia's Bondi Beach, according to Australian government officials and police. One of two gunmen was also dead.

Two people were taken into custody on Sunday as law enforcement officials responded to Australia’s popular Bondi Beach for a "developing incident," the New South Wales Police Force said. Police in a social media message urged the public to avoid the area. Anyone who was there was told to seek shelter.

Officials said a father and son killed at least 15 people at a Jewish holiday celebration. More than three dozen others were hospitalized, including a surviving suspect.

The group said it already had a list of clients booked for December. Then, when the mass shooting happened in Bondi, Australia​, phones would not stop ringing.

Police said around 1,000 people had attended the Jewish celebration, which was held in a small park off the beach.