A woman was stabbed to death after she ran naked into a ditch to escape a man who had set her on fire in Samut Prakan on Monday afternoon.
The attack occurred in full view of people who tried in vain to help her, with one suffering burns.
The attacker fled in a pickup truck.
Police and rescue workers found the body of a woman, aged around 40-45, lying dead in a ditch. She was naked with multiple burns and six stab wounds on her body. A gallon of petrol and pieces of burned clothes were nearby.
Witnesses told police that the attacker was a Thai man, aged around 40-45. He wore only black shorts and fled in a white pickup truck with Bangkok licence plates.
Witnesses saw a woman wrapped in a towel running for help. When the pickup truck driver walked towards her, the witnesses said they guarded her.
The man then walked back to his vehicle and came back with a gallon of petrol. He threw fuel onto her and the others and ignited it, forcing all to flee in flames.
The woman jumped into the ditch to escape, but the man once again went back to his vehicle and returned with a knife, stabbing her before fleeing.
One of the witnesses was an elderly man who suffered burns to his arms and was rushed to a hospital.
Police are hunting the attacker.