NTSB 'monitoring' Baltimore freight train derailment

The newspaper said the crash also caused the collapse of "several industrial buildings."

The NTSB tweeted Tuesday afternoon that it was keeping an eye on the developments in Baltimore, but the agency did not commit to a full investigation yet.

The NTSB is currently investigating a pair of recent highway bridge collapses in Washington state and Missouri that were caused by an oversized truck and a freight rail train hitting support structures, respectively.

Advocates have seized upon the incidents, as well as a recent crash on New York and Connecticut's Metro North commuter rail, to argue that Congress should increase funding for transportation projects.