A large hole can be seen in the Madison Avenue building where a crane dropped its payload May 31, 2015. (Credit: Shawn G. Chittle/Twitter)

NEW YORK (CBSNewYork/AP) — A massive air conditioning unit being lifted by a crane in Midtown Manhattan fell about 28 stories Sunday morning.

Ten people were hurt, but their injuries are not considered to be life-threatening, Mayor Bill de Blasio said.

“It’s obviously a very serious incident. There’s going to be a full investigation,” the mayor vowed.

De Blasio said two of the injured are construction workers, the others include pedestrians and people who were inside passing cars. All were hit by falling debris.

Photos: Crane Accident In Midtown

Police said the call came in around 10:45 a.m. Sunday. Officers who responded to 261 Madison Ave., a high-rise building between East 38th and East 39th streets, found that a crane’s payload heading to the roof of the building had broken free.