According to media reports out of Bahrain, in one mosque, followers of the top Shia cleric chanted “victory for Islam” and death to the ruling family.
Earlier, protesters attended funerals of three of Thursday’s victims. Some said they were ready to die for change.
A pro-government demonstration is also expected to be held, just hours after Bahrain banned public gatherings.
Tanks have been stationed at strategic points around the streets of Manama, a day after demonstrators were cleared from the central Pearl Square.
Soldiers would take every measure necessary to preserve security, the interior ministry said.
Bahrain is ruled by a royal family and a Sunni Muslim elite, but has a Shia majority who make up the bulk of the protesters.
The country’s most senior Shia cleric, Sheikh Issa Qassem, described attacks on protesters as a “massacre” and said the government had shut the door to dialogue, Reuters news agency reported.
As he spoke at emotionally charged Friday prayers in the Duraz neighborhood, supporters shouted “victory for Islam”, “death for Al Khalifa (the ruling family)” and “we are your soldiers”.
Western countries have urged Bahrain to show restraint in dealing with protesters and called for meaningful reform in the small Gulf state kingdom.
Meanwhile, Media reports also coming out of the Libyan city of Benghazi say hundreds of people, at least, have gathered for an anti-government protest.
A lawyer in Benghazi told the BBC that thousands of people were outside the city’s courthouse.
Benghazi has been the scene of protests in recent days, with reports that at least 14 people were killed in clashes with security forces on Thursday.
Large protests are rare in Libya, where dissent is rarely allowed.
Pro-democracy protests have recently swept through several Arab nations, with the presidents of Tunisia and Egypt forced from power amid growing unrest.
The US-based Human Rights Watch said at least 24 people had been killed across Libya in unrest on Wednesday 16th February and Thursday 17th February.
Many others were wounded in the clashes between security forces and protesters, the campaign group said.
(The contents used in this article were obtained from BBCNews)