One more school in the Bulgarian capital Sofia has been shaken by a bomb threat Wednesday.

The call, alerting of a bomb in the 134 School where Hebrew is studied, was placed around 2:30 pm. The search of the premises, located on "Pirotska" street, did not found any traces of explosives.

The police say that parents of teenage pranksters making such calls will be fined with BGN 10 000 to BGN 20 000.

It was reported earlier Wednesday that police have captured a total of five youngsters suspected of making the anonymous bomb hoax calls that affected a dozen of schools in the capital Sofia this week.

A total of 9 high schools, some of them among the most prestigious, received bomb threats Monday.

Three more schools received bomb threats on Tuesday.

Among the institutions in question are the German, French, and Spanish Language High Schools, the First English Language High School, the Sofia Mathematics High School, the 31st Secondary School and the Professional School of Fine Mechanics and Optics.

Two of the youngsters captured are boys aged 15 and 17.

According to the police, the teens placed the calls because they did not want to attend classes.

12 young people, among them girls, have been interrogated in connection with the pranks.