RNA - The fire in the building at Shamalia, South of the capital Manama, was eventually brought under control, said the interior ministry, without explicitly linking it to the executions, Middle East Eye reported.
"According to initial reports, the fire was intentional and the specialised services are taking the necessary measures," the ministry wrote on Twitter.
The blaze came after three men were put to death by firing squad on Sunday over the bomb attack on police in 2014, sparking clashes between angry protesters and security forces.
"Sami Mushaima, Ali al-Singace and Abbas al-Samea were convicted of manufacturing and planting improvised explosive devices (IEDs) that were detonated remotely after luring first responders into the fatal ambush," said a statement by Bahrain's London Embassy.
Their executions were the first in the country since 2010. Rights campaigners said the three men were tortured into confessions.
Protests continued overnight, with dozens of men and women marching through the streets of the village of Sanabes chanting slogans against the Khalifa dynasty, according to witnesses.
Demonstrators tried to reach the main street of Sanabes, the hometown of the three executed men.
Sanabes is the closest village to the Pearl roundabout, the epicenter of a month-long uprising that the security forces crushed in mid-March 2011.
The square's famous monument was razed to the ground after the protesters were driven out.
Protests turned violent in several other villages, according to other witnesses who said police opened fire to disperse demonstrators, wounding several of them.
Bahrain's authorities do not permit international news agencies to cover events independently.
The executions were criticized by international human rights groups, as well as Britain and the European Union.
Sayed Ahmed Alwadaei, director of advocacy at the UK-based Bahrain Institute for Rights and Democracy, called it "a black day in Bahrain’s history" and warned that "King Hamad’s decision to have them killed shows a new contempt for the victims of Bahrain’s abuses".
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