Turkish police on Monday fired tear gas and water cannons at around 10,000 demonstrators protesting a mass trial of hundreds accused of plotting to topple the government, leading to three injuries and a lengthy delay in the hearing.

An AFP photographer saw protesters trying to breach a security barricade by hurling stones at the police outside the prison complex in Silivri, a suburb on the outskirts of Istanbul.

One demonstrator suffered a non-fatal heart attack and two journalists were injured, CNNTurk channel reported, as police tried to disperse the protesters who waved Turkish flags and chanted "justice for all".