After the death of 21 teenagers in a pub in East London, South Africa, the authorities have presented the first investigation results.
According to the toxicological tests, all of the victims had methanol in their blood, said a representative of the health authority of the Eastern Cape province on Tuesday.
It is unclear whether the amounts of methanol involved were lethal.
A clear cause of death is still pending, it said.
Methanol is often found in adulterated alcohol.
The substance is toxic and can cause blindness or even death if consumed in large quantities.
According to the information, the blood tests of the victims also included the alcohol and carbon monoxide content.
The young people, aged 13 to 17, died at a celebration at the end of June.
They had celebrated a birthday and the start of the holidays.
The dead had been found slumped in their chairs and showed no external wounds.
Just under a week ago, the police arrested the owner of the restaurant and two of his employees.
A supervisory authority had previously filed a complaint on suspicion of selling alcohol to minors, a police spokesman reported.