No Australians are believed to have been injured or killed in a lone wolf terror attack in New York that has claimed the lives of eight people.
More than 12 others were injured when the driver of a rented van ploughed into cyclists and pedestrians on a busy bicycle path in Lower Manhattan.
"The State Department has informed us that at this stage they do not believe any Australians are affected, but the situation is still unfolding," Acting Prime Minister Julie Bishop told ABC radio on Wednesday.
Australia's Consul-General to New York Alastair Walton was in the area along the Hudson River when the attack happened.
"He said there are children everywhere in New York today because of course it's Halloween and it's an enormous celebration," Ms Bishop said.
"We think of those who have been affected by this, particularly those who have been killed, their family and friends must be devastated."
Acting Labor Leader Tanya Plibersek and opposition foreign affairs spokewoman Penny Wong issued a joint statement condemning the "despicable attack on innocent civilians".
"The use of a vehicle to target innocent people is, regrettably, an all too familiar act of terror designed to inflict carnage and create fear and division," they said.
"We stand in solidarity with the American people, and especially the people of New York in their defence of freedom and democracy, and their determination to reject those who would seek to divide us."
Ms Bishop advised any Australians in New York to follow the direction of local authorities.
NYPD Police Commissioner James O'Neill says a 29-year-old man was shot in the stomach by officers, after brandishing what appeared to be a pellet gun and paint ball gun, and taken into custody.
He says the driver hit a school bus, injuring two children and two adults before getting out of the van.
Anyone in Australia worried about family or friends in New York can call the consular hotline on 1300 555 135.
