Transcript for Dozens hospitalized after gas leak
We turn to that health emergency north of Chicago. A leaking tanker setting off a toxic cloud that sent dozens to the hospital, some still in critical condition this morning. ABC's Alex Perez is in beach park, Illinois and the NTSB is now heading to the scene? Reporter: Hey, good morning, Cecilia. That's right. That team will investigate what exactly triggered all of this. Now, it made for some tense moments of panic here. Take a look. This was the scene after a tractor transporting trailers filled with anhydrous ammonia started leaking. That leak quickly treated a cloud of toxic fumes that blanketed the area. Those fumes sending 37 people including several first responders to the hospital. Authorities issued a shelter in place for residents. It took officials about six hours to finally give the all clear. Now, investigators were also examining if that chemical was being legally transported. Okay, Alex Perez, thank you. We turn to new developments in that terror attack in Sri Lanka. Authorities now say the leader of the attack, an extremist preacher died in one of the hotel bombings on Easter and the death toll has now been revised. At least 250 people were killed in those attacks. The targeted six hotels and churches, the country remains on high alert this morning.
This transcript has been automatically generated and may not be 100% accurate.