Police have arrested several suspects allegedly involved in a shooting which resulted in a stray bullet hitting a teenager.
The injured 16-year-old student was travelling in a car with her mother after school on Wednesday night.
Metropolitan Police Bureau acting commissioner Sanit Mahathaworn said Thursday details of the arrest and the reason for the shooting would be revealed Friday.
A police source said he suspected the incident took place after a fight between two gangs.
About 8pm on Wednesday, the mother of the victim, Thitiya Songrat, 48, said she and her daughter Arnatta Songrat were driving on Suan Sayam Road when she heard the sound of glass shattering. She saw her daughter collapse with her right shoulder bleeding.
The shooting happened shortly after she picked Arnatta up from a tutorial school at Amorini, a shopping mall on Ram Intra Road.
Ms Thitiya said her panicked daughter jumped out of the car and ran across the road in the direction of a hospital.
But Ms Thitiya said when she got there herself, no one at the hospital knew about a girl with a bullet wound.
Ms Thitiya then found her daughter lying unconscious on a pavement between where she was hit by the bullet and the hospital, she said.
Arnatta, who lost consciousness apparently due to severe bleeding, was rushed to the hospital.
Witnesses told police investigators at Bang Chan police station they saw a group of about five young men in a pickup truck and a car.
They said the men appeared to be waiting nervously for someone near where Soi Suan Sayam 6 meets Suan Sayam Road.
When the group noticed a group of teenagers on motorcycles heading their way, one member fired a gun once but the bullet missed its target and, instead, hit Ms Thitiya's car, police investigators said.
The groups dispersed after the shooting, the investigators said.
Police said a used 9mm bullet casing was found on a pavement on Soi Suan Sayam 6 and collected for examination.
Nopparatrajathanee Hospital director Uthai Tanslaruk said the bullet had pierced the victim's right collarbone and lung and remained in her body.
Although the victim's condition was now stable, doctors will have to wait a week until she gets stronger before they could operate to remove the bullet, Dr Uthai said.