US Secretary of State John Kerry has called on all sides in the Turkey protests to avoid provocative action and said e hopes for a full investigation in to the use of force.
Mr Kerry said that America supports the right to freedom of expression, including peaceful protests.
Turkish shares plummeted more than 10% after riots across the country. The Istanbul national 30 fell to its lowest level since 26th February after several days of anti-government protests.
After an earlier drop Turkish Prime Minister Tayyip Erdogan played down the significance, saying, "it's the stock market, it goes down and it goes up. It can't always be stable".
Anti-government protesters and police have been fighting a running battle for control of Istanbul's Taksim Square on an 11th day of clashes.
"We'll never forget what we have seen in the past few days. People bleeding on the street from rubber bullets and nurses beaten by police."