A military C-130 plane crashed in the southern Philippines on Sunday with death rising to 52 on Monday.

Officials said that investigators have begun to look into what caused the accident.

Two injured soldiers died in the hospital, bringing the total number of military personnel killed in the fatal crash to 49.

The civilian death toll remained at three.

The plane crashed in Patikul town on Jolo Island, 1,000 kilometres south of Manila, Defence Secretary, Delfin Lorenzana, said.

Another 47 soldiers and four civilians were injured in the accident and were being treated in hospital, Mr Lorenzana said.

Some of the survivors jumped off the plane just before it hit the ground, eyewitnesses said.

“The investigating team had arrived in the area,’’ said Major­­­-General Edgard Arevalo, spokesman for the armed forces of the Philippines.

“We are determined to find out what really transpired in this very tragic incident,’’ he added.

“According to available information, the aircraft followed specific protocols regarding approach speed, landing spot and part of the runway where it landed.’’

The weather was good during the landing, while the pilots were experienced and rated, Mr Arevalo said.

The plane crashed and burst into flames after overshooting the runway during its landing on Jolo.

Photos showed the tail section of the cargo plane intact, while other parts were burned and scattered in pieces among coconut trees.

The crash site has been cordoned off as troops searched for the plane’s black box and gathered parts of the wreckage to help in the investigation, Arevalo said.

“All the remains of the 47 soldiers who perished have all been recovered and the tedious process of identification is now ongoing,’’ he added.

The armed forces spokesman noted that most of the bodies were charred.

The aircraft was carrying 96 military personnel, including three pilots and five crew members.

Most of the soldiers were fresh graduates from military training to be deployed to Jolo to help in the fight against the Abu Sayyaf terrorist group, Mr Arevalo said.

Jolo is the stronghold of the Abu Sayyaf, which has been blamed for some of the worst bombings and high-profile kidnappings in the country.

The ill-fated plane was one of only four C-130 aircraft in the air force.

Only one of the remaining C-130 is operational, and it has now been grounded while two others were under maintenance.

“The crashed aircraft was in tip-top shape,’’ he said, denying allegations that the plane was defective.

“It’s not brand new but in very good condition; it still had 11,000 flying hours remaining before the next maintenance of this aircraft.’’

The crash was the third involving a C-130 plane since the 1990s, when the Philippine military began to use the aircraft for troop deployment, logistics run and humanitarian as well as disaster relief operations.

In 1993, 30 people died when a C-130 plane crashed in the eastern province of Camarines Sur while transporting relief goods for typhoon victims.

In 2008, 11 people died when another C-130 went down minutes after it took off from an airport in the southern Davao City.

Sunday’s accident has also raised concern over the safety and condition of the military’s aircraft fleet.

Just last month, a brand-new S70i Black Hawk combat utility helicopter crashed during a night training flight north of the capital, killing all six people aboard.