U.S. authorities in the state of New Jersey are investigating a suspicious package, found Sunday night at a train station, to determine if it is a live bomb, local media reported.

Christian Bollwage, mayor of the city of Elizabeth where the package was found, was quoted as saying that local police received reports from two men who claimed they found a suspicious package with a pipe and wires coming out, the reports said.

The Union County bomb squad was called in and a drone was used to examine the package that was left in a trash can near the train station.

"The drone indicated it could be suspicious and it could be a live bomb," Bollwage said, adding that police would decide how to remove it.

With investigation underway, train service has been suspended between Newark's Liberty Airport and Elizabeth, while New Jersey-bound Amtrak trains from New York are being held at the Penn Station.

The discovery of the package came as the U.S. is on high security alert against terror attacks after 29 people were wounded in a blast Saturday in New York City and the explosion of a pipe bomb earlier Saturday along the route of a Marine charity run in New Jersey.

Nine people were also wounded Saturday night in a stabbing attack at a mall in the northern U.S. state of Minnesota. The incidents, which remain unknown if they are connected, are being investigated as potential acts of terrorism.