Amtrak has restored service on its busy Northeast Corridor line between Newark, New Jersey, and New York's Penn Station.

Train travel had been disrupted for more than an hour Tuesday by brush fires in the New Jersey communities of Kearny and Secaucus. The fires sent large clouds of thick, black smoke billowing into the air, but no injuries were reported.

Service was restored after both fires were extinguished. The fires had also spurred New Jersey Transit to divert its trains into Manhattan to Hoboken, but that service also was restored as of Tuesday afternoon, albeit with delays of up to an hour.

The National Weather Service has issued a "red flag" warning, saying strong winds and dryness are creating ideal conditions for brush fires.