Sofia: A group of six medics said on Friday they were tortured in Libya while in prison on charges of infecting children with HIV.

The Criminal Investigation Service said the five Bulgarian nurses and a Palestinian doctor had started to testify, but did not release further details. All six medics were freed last month.

Libyan leader Moammar Gaddafi's son, Seif Al Islam Gaddafi, on Wednesday admitted the six were tortured with electric shocks - but made no apology and said some torture claims were "lies."

Bulgaria's prosecution service this year charged several Libyan officers with torturing the medics to extract their initial confessions, and has said it is intent on pursuing the case.

A Libyan court in 2005 rejected torture lawsuits by the medics against 10 Libyan officers.