( CNN ) -- Two Metro-North passenger trains heading in opposite directions collided during rush hour Friday evening in southwestern Connecticut , damaging both trains and leaving dozens injured -- some of them critically -- authorities said . A train heading from New Haven to New York City derailed around 6:10 p.m. , hitting the other train in Bridgeport , Connecticut , Metro-North spokeswoman Marjorie Anders said . That caused some cars on the second train , which was destined for New Haven , to likewise leave the tracks . Gov . Dannel Malloy told reporters Friday night that five people were `` critically injured , '' one of whom was in `` very critical condition . '' Two of the 26 people being treated at Bridgeport Hospital are in critical condition , said spokesman John Cappiello . St. Vincent 's Medical Center , also in Bridgeport , treated 41 patients from the incident , hospital spokeswoman Lucinda Ames said . One of those was in serious condition and in intensive care , while the others mostly had minor injuries like `` you might get in a car accident . '' By 9:45 p.m. , 11 of the 67 who had gone to hospitals had been released . A passenger in a middle car of the New York-bound train , Chris Martin , recalled to CNN how his car went dark after the crash , then someone over the intercom `` called all the doctors up front . '' He and others aboard his `` pretty full train '' were evacuated , most of them physically fine if emotionally shaken . But there were signs of injuries outside , as Martin said he personally saw eight or nine ambulances and a number of wounded people on stretchers . Brian Alvarez , who saw the wreckage , described the scene as `` pretty graphic . '' `` I saw this one car and it was completely destroyed , and they were pulling people out of the car , '' Alvarez said . `` ... They were all bloody . '' Power was shut off along the line and service has been halted -- westbound past Bridgeport , which is about 60 miles northeast of New York City on the Long Island Sound , and eastbound beyond South Norwalk -- because of the derailment . Amtrak also announced early Friday night that it had suspended all travel between New York and Boston indefinitely after the crash . Bridgeport Mayor Bill Finch said such travel headaches could persist for weeks , because the two tracks affected by the derailment -- which are both `` shot right now '' -- may take weeks to repair . Because of a bridge replacement project , those two tracks are the only way in and out of New York City by train from that part of Connecticut . Workers will need to not only remove disabled trains , but also remove the tracks , regrade the rail bed , then lay down the tracks again , according to Finch . `` This is our pipeline to New York City , and it 's going to be shut down for some time , '' the mayor said . `` And it 's going to cost this region a great deal of money , frankly , not just to repair it but the lost wages and the lost economy . '' Officials from the National Transportation Safety Board will head the investigation into the crash . Terry Williams , a Washington-based spokesman for that agency , said a team should be on site by 9 a.m. Saturday . `` We have no reason to believe that it 's anything but an accident , '' Gov . Malloy said . CNN 's Morgan Winsor , Brittany Brady , Todd Sperry and Mayra Cuevas contributed to this report .
NEW : NTSB officials should be on site by 9 a.m. Saturday , spokesman says . One train derailed then hit a train going the other way , spokeswoman says . Two hospitals have treated 67 injured people , spokespeople say ; 2 are critical . Comment: