A suicide bomber with Syrian connection triggered the blast President Recep Tayyip Erdogan said.

A powerful blast (Watch the video clip) rocked the Sultanahmet neighborhood which is home to Istanbul’s biggest concentration of monuments and is visited by tens of thousands of tourists every day.

The Radio and Television Supreme Council (RTUK) imposed a temporary media ban for the coverage of the explosion after the demand from the Prime Ministry Zaman Todaynewspaper said.

Turkey is on edge after a series of deadly attacks blamed on the Islamic State (IS) jihadist group including a double suicide bombing in the capital Ankara in October that left 103 people dead.

“Terrorist links are suspected” a Turkish official said earlier of Tuesday’s blast asking not to be named.

“Investigations into the cause of the explosion type of explosion and perpetrator or perpetrators are under way” the Istanbul governor’s office said in a statement quoted by the Dogan news agency.

Images published by Dogan showed several apparently dead bodies lying on the ground.

The Dogan reported that at least six Germans one Norwegian and one Peruvian are among those injured in the explosion. Seoul’s foreign ministry said one South Korean had a minor finger injury.

‘The ground shook’

The explosion was powerful enough to be heard in adjacent neighborhoods witnesses said. Police cordoned off the area to shocked passers-by and tourists and the nearby tram service was halted.

“The explosion was so loud the ground shook. there was a very heavy smell that burned my nose” a German tourist named Caroline said.

“I started running away with my daughter. We went into a nearby building and stayed there for half an hour. It was really scary” she added.

“The explosion was very loud. We shook a lot. We ran out and saw body parts” one woman who works at a nearby antiques store told a Reuters correspondent declining to give her name.

Media reports said the blast took place at 8.20 GMT around the Obelisk of Theodosius a monument from ancient Egypt which was re-erected by the Roman Emperor Theodosius and is one of the city’s most eye-catching monuments.

Ambulances rushed to the site which is close to the Blue Mosque and Hagia Sophia in Sultanahmet.

A large number of fire-fighting trucks medical teams and bomb disposal teams were dispatched to the area and a police helicopter was seen circling overhead at the site.

The wounded have been taken to HasekiTraining and Research Hospital and nearby hospitals.

A police vehicle heading to the area where the explosion took place overturned near Sultanahmet tram station.

Police sealed off the central square after the blast barring people from approaching it in case of a second explosion.

“We’re taking precautions against a second explosion” the police officer said.

Tram operations between Beyazt and Eminonu have been suspended and the square has been closed to traffic.

Prime Minister Ahmet Davutoglu and Interior Minister Efkan Ala met at the Prime Ministry’s office to discuss the incident.

Kurdish leftist and Islamist militants have all carried out attacks in Turkey in the past.