A large billboard collapsed onto a group of pedestrians in India late Monday evening, killing at least 14 people and injuring 74 others, officials said.

According to city officials, a 100-foot-tall billboard fell onto a gas station in the suburb of Ghatkopar in the western city of Mumbai on Monday evening. At least 47 people were rescued late into the night.

The collapse took place during a thunderstorm which included heavy rain and high winds.

Police are investigating the collapse and say the billboard may have been illegally installed, according to the Press Trust of India news agency.