A cargo plane traveling from the United Arab Emirates to Pakistan disappeared on Tuesday, with five crew members on board.

The plane, a Boeing 737 labeled AP-BOI, disappeared from radar off the coast of Karachi, Pakistan, about 80 minutes into its two-hour flight from Sharjah, United Arab Emirates.

The Pakistan Airports Authority said in a series of X posts on Tuesday that the flight reported a problem in the navigation system at around 9:18 pm local time and was guided by the Karachi area control center.

Three minutes later, the flight was observed “descending rapidly” before losing contact and communication with the control center, the authority wrote.

According to data from flight tracker FlightRadar24, the plane was seen circling off the coast of Pakistan before sinking at a speed of 22,400 feet per minute and disappearing from the map. FlightRadar24 wrote in an X post that data indicates a “possible accident at sea southwest of Karachi.”

In a Facebook post early Wednesday morning, K2 Airways shared the names of five crew members, including a pilot, a first officer, a loadmaster and two engineers. He said he was cooperating with government agencies for the investigation and continued to “fervently pray for the safety of our colleagues.”

K2 Airways is a Karachi-based cargo carrier with a fleet of Boeing 737 aircraft. According to FlightRadar24, the ill-fated aircraft has been operating with K2 Airways since 2024. Before that, it was a passenger aircraft with Aeroflot and Garuda Indonesia, and a cargo aircraft with TNT Airways and ASL Airlines.

Representatives for K2 Airways and the Pakistan Airports Authority did not respond to a request for comment from Business Insider.

Pakistan has witnessed some serious air accidents in the last two decades. In 2020, an Airbus A320, operated by Pakistan International Airlines, crashed near Jinnah International Airport in Karachi, killing 98 people on board.

In 2019, a Pakistan army military plane crashed into a city of Rawalpindi in the north of the country, killing five crew members and 13 civilians on the ground.

And in 2010, an Airblue flight crashed north of the capital, Islamabad, killing more than 150 people on board.