A senior Thai army officer has turned himself in over his alleged involvement in a human trafficking scandal, marking the first arrest of a military official since the investigation started last month.

Lt. Gen. Manas Kongpaen, a senior adviser to the Royal Thai Army, is facing multiple charges, including human trafficking, detention and ransom.

More than 50 people, including several local politicians and officials, were arrested after the discovery of dozens of bodies believed to be those of Myanmar's Rohingya migrants at the abandoned trafficking camps near the Thai-Malaysian border.

National police chief Gen. Somyot Poompanmoung said Wednesday that Manas denied the charges.

Before Manas' arrest warrant was issued this week, the army chief had denied the military's involvement in the trafficking syndicates.