The aircraft, which crashed southeast of Bangkok 11 minutes after takeoff and lost touch with ground control, carried four Thais in all, including the two pilots.
With all nine passengers on a charter jet that crashed the day before believed dead, Thai rescuers searched muddy, wooded terrain with hoes on Friday, according to authorities.
The Cessna Caravan C208B aircraft, which went down around 60 miles southeast of Bangkok, had five Chinese tourists and four Thai people, including the two pilots. The plane had lost touch with ground control 11 minutes after takeoff.
As investigators race to determine what caused the tragedy, Chonlatee Yongtrong, the governor of Chachoengsao province, where the charter jet crashed, declared that all occupants are believed dead.
The governor told reporters late on Thursday, “We found many human remains,” noting that the swampy terrain made the search more difficult.
The aircraft descended vertically, necessitating a 10-meter (33-foot) excavation.
Images from the scene depict airplane wreckage strewn across a marshy, wooded region, as rescuers excavate using hoes and use a pump to remove water from some spots, as police forensic teams attempt to locate and reconstruct the victims.
The aircraft, flying flight TFT209, departed from the capital’s Suvarnabhumi airport on Thursday afternoon and was bound for the eastern region of Trat.
Eleven minutes after takeoff, the aircraft—which was registered to Thai Flying Service Co., as per the aviation regulator—lost touch with ground control in Bangkok, according to provincial officials.