Australian police said Friday they arrested seven people as part of an investigation into a plot to attack central Melbourne on or around Christmas Day.

Prime Minister Malcolm Turnbull said the alleged terrorists planned to “explode improvised explosive devices” in the city’s business district.

He called it “one of the most substantial terrorist plots that have been disrupted over the last several years.”

There is no ongoing threat, police said.

‘They have been thwarted’

“We are approaching the Christmas season – a time when we come together in peace and love with our families. We congregate in public places for Christmas, for New Year’s Eve,” Turnbull said.

“It is a time of happiness and joy. These terrorists sought to disrupt it. They have been thwarted. They are in custody. They are no longer a threat to Australia’s security.”

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