Turkey was on Monday hit by a slew of deadly attacks, with six members of the security forces killed and the U.S. consulate in Istanbul hit by a gun attack.

The authorities blamed the violence on Kurdish and Marxist radicals, as Ankara presses a two-pronged "anti-terror" offensive against Islamic State (IS) jihadists and Kurdistan Workers' Party (PKK) militants following a wave of attacks in the country.

A Turkish policeman was killed on Sunday during clashes with leftist protesters in the the flashpoint Istanbul district of Gazi, the official Anatolia news agency reported.

Policeman Muhammet Fatih Sivri was shot in the chest from inside a building while he tried to make an arrest during clashes which have raged all day, it said. He was rushed to hospital but died from his wounds.

The Istanbul authorities on Saturday banned a planned anti-jihadist "peace march" scheduled to take place in the Turkish metropolis this weekend, citing security and traffic congestion.

The pro-Kurdish Peoples' Democratic Party (HDP) has hoped to rally thousands on Sunday for the protest to condemn violence by Islamic State (IS) jihadists following a suicide bombing on Monday that killed 32.

Turkey on Friday detained 251 people in coordinated nationwide dawn raids against suspected Islamic State (IS) jihadists and Kurdish militants following a wave of deadly violence in the country, the prime minister's office said.

"A total of 251 people were taken into detention for belonging to terrorist groups," the statement said, adding that the raids took place in 13 provinces across Turkey.

Turkey on Tuesday stepped up security on the border with Syria after a suicide bombing blamed on Islamic State extremists killed 31 people and raised fears of a spillover of the Syrian conflict onto its territory.

Monday's attack in a town on the border with Syria was one of the deadliest attacks in Turkey in recent years and the first time the government has directly accused the IS group of carrying out an act of terror on Turkish soil.

Turkey's top administrative court has removed its block on the controversial redevelopment of an Istanbul park that in 2013 sparked the most serious anti-government protests in years, a pressure group said Thursday.

Istanbul authorities had planned to rebuild an Ottoman-era barracks on the site of Gezi Park, one of the few green spaces in the city center, at the fringes of Taksim Square.

Turkey on Friday detained 21 suspected members of the Islamic State group, including three foreigners, in a major operation in several cities including Istanbul, state media said.

Police detained the suspects in pre-dawn raids in several addresses in Istanbul, as well as Sanliurfa province near the Syrian border, southern Mersin province and Kocaeli province east of Istanbul.

Riot police in Istanbul used teargas and fired rubber pellets to disperse thousands of participants in the city's Gay Pride march after some began chanting slogans against the president, an AFP reporter said.

The scene turned violent when participants -- many brandishing rainbow flags -- denounced "the fascism" of the conservative President Recep Tayyip Erdogan.

Turkish police on Sunday tightened security around Istanbul's Taksim square, on the second anniversary of the mass anti-government protests that rocked the square in 2013.

Police blocked major roads leading to the square and the adjoining Gezi Park, and public transport links in the area were suspended, an AFP photographer said.

Cash belonging to Turkey's Central Bank littered the ground of Istanbul's Ataturk Airport after bags of money split open while in transit for Zurich, local media said Friday.

Dozens of stray 10 Turkish Lira bills ($4, 3.4 euros) blew around the apron late Thursday after two sacks from a total 170 note-stuffed bags fell from the cargo hold of a Turkish Airlines plane in transit for Zurich, private Dogan news agency reported.