Two separate plane crashes in North Carolina and Colorado killed at least seven people over the Labor Day weekend, the National Transportation Safety Board said Monday. A Beechcraft A36 aircraft crashed in Forsyth County of North Carolina on Monday killing all three people aboard and a Cessna 310 plane went down Sunday in a remote part of Colorado’s San Juan Mountains leaving at least four people dead, according to NTSB.

The Beechcraft A36 was headed from Sarasota, Florida, to Piedmont Triad International Airport in Greensboro, North Carolina, NTSB spokesman Peter Knudson said, according to Greensboro News and Record, a local news network. The pilot had contacted the air traffic control, saying he was “a bit disoriented and was having trouble locating the airport,” according to Knudson.

Kevin Baker, the airport's executive director, said the crash occurred right after the pilot called the control room. "What sounds like happened is the pilot was unable to tell the tower what the problem was but said they had a problem and within the next few moments is when the crash occurred," Baker reportedly said. 

Authorities did not reveal the names of the deceased. Knudson reportedly said that NTSB will reach the crash site on Tuesday for investigation.

The other crash incident on Sunday evening involved a twin-engine Cessna 310 bound to Amarillo, Texas, from Flagstaff, Arizona. The plane was reported overdue by a relative of one of the passengers on Sunday, Federal Aviation Administration (FAA) spokesman Ian Gregor told NBC News.

The NTSB initially said five people were on board the plane, but the San Juan County Sheriff's Office said there were four passengers. The victims were not identified, Knudson reportedly said, adding that the confusion about the number of passengers might have occurred because of an inaccurate flight plan filed with the FAA.

The Colorado National Guard and San Juan County authorities have found the plane wreck and were trying to recover the bodies, Reuters reported.

The NTSB and FAA were scheduled to arrive at the crash site for investigation Monday night.