A small jet carrying four people crashed on takeoff Thursday morning from a small airport in central Connecticut and hit a building, setting it on fire. 

The two pilots and two passengers on board were killed.

The Cessna Citation 560X took off just before 10 a.m. from Robertson Field airport before crashing into the building at Trumpf Inc., a manufacturing company, Farmington Police Lt. Tim McKenzie said.

"Suffered a mechanical failure on the airport behind me, at Robertson airport, while taking off," says McKenzie. "And then impacted the ground and then the building."

The jet was headed to Dare County Regional Airport in Manteo, North Carolina, the Federal Aviation Administration said.

Officials say the plane's fuel supply helped to feed the fire for hours.

Fran Nussbaum, from East Granby, says the electricity went out and she heard a big bang.

Nussbaum described what she saw to News 12. "A big fireball at the corner of the building and tons of black smoke."

McKenzie says nobody was injured in Trumpf building.

A statement from the Trumpf, Inc to News 12 reads, "On the morning of Thursday September 2, 2021, an airplane crashed into TRUMPF's production facility located at 111 Hyde Rd. in Farmington, CT. At this time, all employees who were inside the affected building have been accounted for with two injuries reported. Additional information will be provided as it becomes available."

The National Transportation Safety Board is on scene investigating. They say the official report on the crash is forthcoming.