The Canadian Coast Guard says there's no danger to the crew of 21 on board the Australian Spirit, but it is monitoring the situation.
The 250-metre ship is roughly 75 nautical miles from Chebucto Head, near Halifax. The ship was travelling from Placentia, N.L., to New York.
Teekay Corporation, the company that owns the ship, says the Atlantic Larch tug has joined the Australian Spirit and second tug is on the way from Halifax.
Company spokesman Jonathan Anthony says crew and cargo are safe.