The explosion was in Istiklal Street, a wide boulevard closed to traffic that is lined with international stores and shopping centers.

Five people including a suicide bomber were killed and 36 wounded in a suspected attack by Kurdish militants on a major shopping and tourist district in central Istanbul on Saturday.

The fourth suicide bombing in Turkey this year hit part of Istiklal Street, a long pedestrian zone lined with global brand name shops and foreign consulates, just a few hundred meters from an area where police buses are usually parked.

Preliminary findings indicate that the outlawed Kurdistan Workers Party (PKK) or an affiliate carried out the attack, a senior Turkish official told Reuters.

“The attacker detonated the bomb before reaching the targeted point because they were scared of the police,” the official said, adding the bomber had planned to hit a more crowded spot.

Armed police sealed off the shopping street where half a dozen ambulances had gathered. Forensic teams in white suits scoured the area for evidence. Police helicopters buzzed overhead and panicked shoppers fled the area, ducking down narrow side streets.

“My local shopkeeper told me someone had blown himself up and I walked towards the end of the street,” one neighborhood resident told Reuters.

“I saw a body on the street. No one was treating him but then I saw someone who appeared to be a regular citizen trying to do something to the body. That was enough for me and I turned and went back.”

Istiklal Street, usually thronged with shoppers on weekends, was quieter than normal before the blast as more people are staying home after a series of deadly bombings.

Health Minister Mehmet Muezzinoglu confirmed that 36 people had been wounded and seven of those were in serious condition. Twelve of the wounded were foreigners, he said.

Two Israeli citizens were killed in the blast, Israeli Prime Minister Benjamin Netanyahu said. Speaking to reporters in Jerusalem, Netanyahu said a third Israeli citizen may have been killed in the blast.

One Iranian were among those killed, CNNTurk reported.

The White House said in a statement that two American citizens were killed in the attack.

“We are in close touch with Turkish authorities and reaffirm our commitment to work together with Turkey to confront the evil of terrorism,” White House National Security Council spokesman Ned Price said.

Several Israelis were among those hurt in the sixth major bombing in Turkey since July, the deputy health minister Ahmet Baha Otuken had said.

Israel had chartered two aircraft to repatriate the injured to their homeland, a spokesman for the emergency services said in Jerusalem.

“We as a nation are unfortunately now face to face with a situation of unlimited, immeasurable acts that are inhumane, defy human values and are treacherous,” Muezzinoglu said.

Turkish Prime Minister Ahmet Davutoglu denounced the suicide bombing as “inhumane” and said Turkey would continue its struggle against “centers of terrorism”.

“No center of terrorism will reach its aim with such monstrous attacks,” he said in a written statement. “Our struggle will continue with the same resolution and determination until terrorism ends completely.”

Deadly bombings

A suicide car bombing in the capital Ankara killed 37 people this month. A similar bombing in Ankara last month killed 29 people. A Kurdish militant group has claimed responsibility for both of those bombings.

In January, a suicide bomber killed around 10 people, most of them German tourists, in Istanbul’s historic heart, an attack the government blamed on ISIS.

NATO member Turkey faces multiple security threats. As part of a US-led coalition, it is fighting ISIS in neighboring Syria and Iraq. It is also battling PKK militants in its southeast, where a 2-1/2-year ceasefire collapsed last July, triggering the worst violence since the 1990s.

In its armed campaign in Turkey, the PKK has historically struck directly at the security forces and says that it does not target civilians. However, the recent bombings suggest it could be moving toward a tactical shift. A claim of direct responsibility for Saturday’s attack could underscore that.

The PKK is looking to carry out attacks aggressively during the coming Newroz spring holiday, the official said.

Newroz, which falls on March 21, is Kurdish New Year.

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