Blasting at the construction site for a new subway line shattered windows and sent smoke billowing up to the street on Tuesday, but no injuries were reported.

Metropolitan Transportation Authority spokeswoman Marjorie Anders said something went wrong as contractors were blasting a tunnel for the Second Avenue subway at about 1 p.m.

Officials were trying to figure out what happened at the construction site, beneath East 72nd Street and Second Avenue.

A vacate order was issued as a precaution for the ground floor of one building that had several windows blown out, said Tony Sclafani, spokesman for the city's buildings department.

The Kolb Art Gallery, which sells custom paintings and furniture, is located on the ground floor. Workers were removing pieces of art off a desk in the gallery after the blast.

Diana Mighiu, an employee at the gallery, said flying rocks flew through the door after the explosion, which damaged some store merchandise, including lamps and vases.