- 26 updates
Turkish security forces have arrested four people in connection with the suicide bombing in Istanbul in which 10 German tourists were killed, Turkish prime minister Ahmet Davutoglu has said.
Davutoglu said that the suicide bomber had entered Turkey as a migrant, adding that the perpetrator had not been monitored because they was not on a watch list.
Speaking to journalists, the Turkish prime minister said that six of those wounded in the blast remained in hospital, and vowed a more visible security presence in built up areas.
He said the bomber had not specifically targeted Germans.
All 10 people killed in Tuesday's suicide bombing in Istanbul were German, authorities have revealed.
A German foreign ministry spokeswoman made the announcement on Wednesday following the attack in Sultanahmet Square, near the Blue Mosque and Hagia Sophia, a popular tourist destination.
The bomber was a member of so-called Islamic State. It was thought he was born in 1988 and recently traveled to Turkey from Syria.
Turkish authorities have detained three Russian nationals suspected to have links to the so-called Islamic State following a suicide bomb attack in Istanbul on Tuesday.
Ten people were killed in the blast at Istanbul's historic Sultanahmet Square, an area popular with tourists.
The Russian Consulate in Turkey has confirmed the detentions, according to Russian media.
The blast in Istanbul was a strike on the Turkish people and its tourism with at least eight German tourists killed as they enjoyed a New Year holiday.
Authorities say they foiled an attack in November and another at New Year but the attack today shows that the country has become a target for terrorism and may face more in the future.
ITV News Correspondent Emma Murphy reports.
Turkish police detained nearly 60 suspected Islamic militants in raids across the country following a suicide bombing in Istanbul.
Some 21 of the 60 suspects were detained in the south-east city of Sanliurfa.
The raids come after at least 10 people were killed by a suicide bomber in Sultanahmet Square in Istanbul.
Turkey's prime minister said the suspected bomber was a foreign member of Islamic State.
David Cameron has offered Turkey British assistance to find the organisers of a bomb attack in Istanbul.
At least 10 people were killed and 15 injured in a blast that Turkish president Recep Tayyip Erdogan described as "Syria-linked".
In a telephone call this evening, Mr Cameron offered his condolences to President Erdogan, a spokesperson for Downing Street said.
At least nine killed in the Istanbul bomb attack are German citizens, a senior Turkish government official told Reuters.
The suspected Istanbul suicide bomber was a foreign member of Islamic State, the Turkish Prime Minister said.
The suspected bomber is thought to have recently crossed into Turkey from Syria, Ahmet Davutoglu added.
He was not on Turkey's watch list of suspected militants.
Thousands of people are being tracked by Turkey for suspected militant links but the bomber was not one of them.
The majority of the 10 people killed in the explosion in central Istanbul earlier today were German citizens, Turkey's Prime Minister Ahmet Davutoglu has told Angela Merkel by phone, according to Reuters.
Mr Davutoglu told the German Chancellor that an investigation into the apparent suicide attack, which also wounded at least 15 people, would be shared with German officials.
Earlier, Ms Merkel had expressed worry that some fellow Germans may have been caught up in the tragedy, saying the world must act against terrorism.
"International terrorism has shown its ugly face," said Merkel. "We need to act decisively against it."
Latest ITV News reports
The attacks on Turkey are not so much a watershed but a deepening of Islamic State's strategy to drive tourists away from Muslim countries.