President Donald Trump offered his condolences to the victims of a trio of attacks at Brown University, in Sydney, Australia, and in Syria on Sunday.

As he arrived at the White House's Christmas reception, Trump paid tribute to those killed and injured in the three attacks.

The shooting happened during a mission by U.S. and Syrian forces in a historic central town near Palmyra on Saturday. President Trump and U.S. military officials attributed the attack to ISIS.

President Trump vowed retaliation Saturday after two U.S. Army soldiers and a civilian U.S. interpreter were killed in an attack in Syria, an incident the Pentagon said occurred during “a key leader engagement.

The spiritual head of Israel's Druze community is calling on the United States to take action in support of minority rights.

Syria's new government faces accusations of extremism as U.S. mediates complex negotiations between Damascus and Jerusalem authorities.

President Trump speaks about a weekend of violence across the world, including mass shootings at Brown University and Australia’s Bondi Beach, as well as a deadly attack on U.S. service members in Syria.

Trump said he was briefed on the Brown shooting that killed two, initially claiming the suspect was in custody.