The Prime Minister has used his last appearance before voting closes to confirm an unauthorised vessel from Sri Lanka has been intercepted on its way to Australia. 

Speaking after casting his ballot in his home electorate of Cook in Sydney, Mr Morrison told journalists reports of an interception were correct. 

"I can confirm that there's been an interception of a vessel en route to Australia. That vessel has been intercepted in accordance with the policies of government and they're following those normal protocols," he said. 

"In the interests of full transparency in the middle of an election campaign, the Labor Party was advised of this and a statement has been issued by the border protection authorities."

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The Australian Border Force has issued a statement confirming a vessel had been intercepted in a 'likely attempt to illegally enter Australia from Sri Lanka". 

"The Australian government's policy remains unchanged. We will intercept any vessel seeking to reach Australia illegally and to safely return those on board to their point of departure or country of origin," the statement said. 

"Measures and safeguards are in place to enable actions and activities to be undertaken in accordance with Australian domestic law and Australia's obligations under international law.

"The overriding priority for all agencies involved in Operation Sovereign Borders is the safety of all persons involved, including potential illegal immigrants and vessel crews as well as Australian personnel."

"In line with long-standing practice, we will make no further comment."

The last boat turn-back occurred in January 2020. 

Labor Home Affairs Shadow Minister Kristina Keneally said Labor supported Operation Sovereign Borders, including offshore processing, regional resettlement and boat turn-backs where safe. 

"The people-smuggling trade is vile and risks the lives of the people at sea," Senator Keneally said. 

"To be clear: If you attempt to come to Australia by boat you will not make it and you will be turned around, or sent to Nauru."