Federal Investigation Searches for Cause of Conn. Train Crash (VIDEO)

Investigators from the National Transportation Safety Board will begin a probe into what caused a commuter train crash that sent 70 people to the hospital Friday evening, according to CNN. The accident occurred at 6:10 p.m. in Bridgeport, Conn., when a train headed from New York City to New Haven, Conn., derailed and hit another train traveling in the same direction.

Fairfield police spokesman Lieutenant James Perez told the Associated Press that it was too early in the investigation to rule any possible causes out.

"At this stage, we don't know if this is a mechanical failure, an accident, or something deliberate," Perez said.

Connecticut Governor Dannal Malloy was at the scene 3 hours after the crash where he told the Associated Press that there was no reason to believe that the crash was anything other than an accident.

"We're most concerned about the injured and ultimately reopening the system," Malloy said.

The Metro-North and Amtrak have suspended service indefinitely. Bridgeport Mayor Bill Finch was concerned that travel in the area will be disrupted for a few weeks since the tracks where the derailment happened were pretty much destroyed, according to CNN.

"This is our pipeline to New York City and it's going to be shut down for some time," Finch said. "A lot of people rely on this and we've got to get this reconnected as soon as possible."

The impact of the accident will be felt even more because the two tracks where it took place are the only two tracks in or out to New York City in the area due to ongoing construction projects, reports the Associated Press.

Bridgeport police chief, Joseph Gaudett, was thankful that no lives were lost in the accident. Gaudett told the Associated Press that the emergency response to the accident worked smoothly and everyone who needed medical attention was able to receive it.

"Everybody seemed pretty calm," Gaudett said. "Everybody was thankful they didn't get seriously hurt. They were anxious to get home to their families."