Dubai: A Bahraini court jailed nine for life on Monday after convicting them of making bombs for terrorist purposes and for their alleged involvement in a 2011 attack, a judicial source said.

Four of the defendants were in court for the verdict and the remaining five, tried in absentia, were handed 10 additional years in jail for failing to hand themselves in. Life imprisonment in Bahrain is a 25-year sentence.

Monday’s ruling brings to 104 the number of opposition activists jailed since September 29 in connection with violence in the Gulf kingdom that began with the February 2011 protests.

In court the four men had alleged that they were tortured, mistreated and held in solitary confinement, according to lawyers.

The defendants were found guilty of “joining a group with the intention of disturbing public order and using terrorism to endanger Bahrain’s security”, the charge sheet said.

They were also convicted of making bombs and training others how to produce them, and “owning and using explosives for a terrorist purpose and carrying out bombings to terrorise citizens”.

Bahrain’s attorney-general said that investigations proved the defendants were involved in “bombings” carried out on November 22, 2011, near the Exhibition Park in the capital Manama.

The attack damaged several cars but caused no casualties.

Monday’s ruling is the fifth tough sentence handed to opposition activists since late last month.

In August, King Hamad Bin Eisa Al Khalifa decreed stiffer penalties for terror acts in the country rocked by protests since March 2011.

These include a minimum 10-year jail term for an attempted bombing. If the attacks cause casualties, the sentence can be life imprisonment or the death penalty.

Bahraini activists continue to demonstrate in villages outside the capital and frequently clash with police.

At least 89 people have been killed since the protests began two and a half years ago, according to the International Federation for Human Rights.