An overpass collapsed Thursday in a congested area of the eastern Indian city of Kolkata, crushing vehicles below it, killing at least 15 people and leaving dozens more missing, police said.

More than 100 people were unaccounted for after the incident, said Sgt. Saurav Benerjee of Kolkata police, as CNN reported.

However, authorities stressed that just because people have been reported missing doesn’t mean they’re trapped.

The overpass has been under construction for five years and has missed several deadlines for completion.

“The condition is pathetic. At this moment no one has any clue how many people are trapped,” said Raichand Mohta, a police officer at the scene.