Protests rage in Istanbul's Besiktas
Turkish protesters have clashed with police in Istanbul's Besiktas district, in some of the worst violence since unrest erupted three days ago, BBC reported.
Mosques, shops and a university have been turned into makeshift hospitals to deal with the injured.
Protesters tore up paving stones to build barricades, and police responded with tear gas and water cannon.
Protests were sparked by plans to build on an Istanbul park but have broadened into nationwide anti-government unrest.
Officials say more than 1,700 people had been arrested during protests in 67 towns and cities, though many have since been released.
Late on Sunday the White House said in a statement that all parties should "calm the situation", and reaffirmed that peaceful demonstrations are "part of democratic expression."
The US previously criticised the security forces for their initial response to the protest.