Two Bahraini ministers have resigned to protest against the government's use of excessive force against Shia protesters in the kingdom, Press TV reported.
Bahrain's ministers of health and housing, both Shias, quit their posts on Wednesday.
Soldiers and riot police expelled hundreds of protesters from a landmark Pearl Square in Bahrain's capital on Wednesday, using tear gas and armored vehicles. At least five people were killed as clashes flared across the kingdom, according to witnesses and officials.
Troops from Saudi Arabia and other Gulf Cooperation Council (GCC) member states were dispatched to Bahrain at the country's government's request to help quell the uprising by majority Shiite Muslims against the Sunni leadership.
Nezar bin Sadeq al-Baharna, who was recently appointed health minister, said he no longer can witness people being mistreated in the Salmaniya hospital.
Sources at the Salmaniya hospital said it had been surrounded by troops, and no-one was being allowed in or out. The wounded are now reportedly being treated in mosques or at home.
A doctor there told the BBC that she and her colleagues were hiding from troops who had taken over the building and were shooting at people inside the hospital, threatening the doctors with live ammunition.
"They are all around Salmaniya medical complex with their guns and they are shooting anybody," she said.