Australian Veterans Affairs Minister Dan Tehan urged the nearly 500 Australians and New Zealanders registered to travel to Gallipoli, Turkey, to mark ANZAC Day on April 25 to exercise a high degree of caution amid the warning, but offered no specifics about the alleged threat.
ANZAC Day is an annual holiday commemorating the April 25, 1915, landings in Gallipoli the first major military action fought by the Australian and New Zealand Army Corps during World War I.
"It is just that terrorists may indeed try to carry out a terrorist attack during the celebrations," Phelan told reporters in the nation's capital, Canberra. "That is all we have got at this stage."
Tehan said Australia and New Zealand were working closely with Turkish authorities on security arrangements, but that the commemoration was scheduled to continue as planned.
In 2016, police arrested a 16-year-old and charged him with planning an attack on an ANZAC ceremony in Sydney. In a statement, New Zealand Foreign Minister Murray McCully urged New Zealanders in Turkey to be vigilant in public places and monitor the media for updates on potential safety risks.