U.S. Embassy warns citizens about 'credible threats' in Turkey

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U.S. Embassy In Turkey Warns About 'Credible Threats'

The United States warned its citizens on Saturday about "credible threats" to tourist areas in Turkey, particularly in Istanbul and the southwest coastal resort of Antalya.

Turkey has been hit by four suicide bombings already this year, the most recent one last month in Istanbul. Two of those have been blamed on Islamic State, while Kurdish militants have claimed responsibility for the other two.

Click through images from a suicide bomb explosion in Istanbul:

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U.S. Embassy warns citizens about 'credible threats' in Turkey
Members of Turkish medical association (TTB) stand after laying flowers in Istanbul's tourist hub of Sultanahmet where at least 10 people were killed and 15 wounded in a suspected terrorist attack, on January 12, 2016. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
German Interior Minister Thomas De Maiziere leaves flowers in tribute to the victims at the site of yesterday's attack in the city's tourist hub of Sultanahmet on January 13, 2016 in Istanbul. Turkish authorities probed how a jihadist from Syria killed 10 mainly German tourists in an attack in the heart of Istanbul that raised alarm over security in the city. / AFP / BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
A picture taken on January 13, 2016 shows flowers and a scarf of German football team Bayern Munchen in tribute to victims of January 12 deadly attack in Istanbul's tourist hub of Sultanahmet. Turkey said on January 13, 2016 it had arrested one person in connection with a deadly suicide bombing that ripped through the historic heart of Istanbul, killing 10 German tourists and raising alarm over security in the country. / AFP / BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
Turkish Prime Minister Ahmet Davutoglu (R) and his wife Sare Davutoglu, together with German Interior Minister Thomas de Maiziere arrive to place flowers in tribute to the victims at the site of yesterday's attack in the city's tourist hub of Sultanahmet on January 13, 2016 in Istanbul. Turkish authorities probed how a jihadist from Syria killed 10 mainly German tourists in an attack in the heart of Istanbul that raised alarm over security in the city. / AFP / BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
ISTANBUL, TURKEY - JANUARY 13: People leave roses for the ones who lost their lives in an attack at Sultanahmet square after it has been reopened to media and public in Istanbul, Turkey on January 13, 2016. A blast at Istanbuls Sultanahmet tourist district on Tuesday morning killed 10 people and wounded 15 others. A Syrian suicide bomber carried out Tuesdays attack in Istanbuls Sultanahmet tourist district, Turkeys president said. (Photo by Onur Ãoban/Anadolu Agency/Getty Images)
Tourists walk backdropped by the Sultan Ahmed Mosque, better known as the Blue Mosque, in the historic Sultanahmet district of Istanbul, following an explosion nearby, Tuesday, Jan. 12, 2016. The explosion killed several people and wounded 15 others Tuesday morning in the historic district of Istanbul popular with tourists. Turkish President Recep Tayyip Erdogan said a Syria-linked suicide bomber is believed to be behind the attack.(AP Photo/Lefteris Pitarakis)
Police search the area at the historic Sultanahmet district after an explosion in Istanbul, Tuesday, Jan. 12, 2016. An explosion killed at least 10 people and injured 15 others Tuesday morning in a historic district of Istanbul popular with tourists, the Istanbul governor's office said. (AP Photo/Lefteris Pitarakis)
Turkish police block access to the Blue Mosque area on January 12, 2016 after a blast in Istanbul's tourist hub of Sultanahmet left 10 people dead. Ten people were killed and 15 wounded in a suspected terrorist attack on January 12 in the main tourist hub of Turkey's largest city Istanbul, officials said. A powerful blast rocked the Sultanahmet neighbourhood which is home to Istanbul's biggest concentration of monuments and and is visited by tens of thousands of tourists every day. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
ISTANBUL, TURKEY - JANUARY 12: Ambulances gather around Sultanahmet tourist district after an explosion in Istanbul, Turkey on January 12, 2016. Turkish police have sealed off central Istanbul square in historic Sultanahmet district after the explosion was heard. Ambulances raced to the scene in the minutes after the explosion. (Photo by Veli Gurgah/Anadolu Agency/Getty Images)
Policemen install security barriers at the historic Sultanahmet district, which is popular with tourists, after an explosion in Istanbul, Tuesday, Jan. 12, 2016. Turkish media reports say several people have been injured in the explosion. (AP Photo/Lefteris Pitarakis)
Ambulances and firefighters stationed near the city's landmark Sultan Ahmed Mosque or Blue Mosque after an explosion at Istanbul's historic Sultanahmet district, which is popular with tourists, Tuesday, Jan. 12, 2016. The Istanbul governor's office says the explosion at the city's historic Sultanahmet district has killed least 10 people. A statement says 15 other people were injured in Tuesday's blast. The cause of the explosion is under investigation, but state-run TRT television says it was likely caused by a suicide bomber. The monument in the background is "German Fountain." (IHA via AP) TURKEY OUT
ISTANBUL, TURKEY - JANUARY 12: Ambulances gather around Sultanahmet tourist district after an explosion in Istanbul, Turkey on January 12, 2016. Turkish police have sealed off central Istanbul square in historic Sultanahmet district after the explosion was heard. Ambulances raced to the scene in the minutes after the explosion. (Photo by Arif Hudaverdi Yaman/Anadolu Agency/Getty Images)
This image from video shows medics and security members with injured people lying on the ground after an explosion at Istanbul's historic Sultanahmet district, which is popular with tourists, Tuesday, Jan. 12, 2016. The cause of the explosion, which could be heard from several neighborhoods, was not immediately known but TRT said the blast was likely caused by a suicide bomber. (IHA via AP) TURKEY OUT
ISTANBUL, TURKEY - JANUARY 12: A wounded man is seen on the ground at the Sultanahmet tourist district after an explosion in Istanbul, Turkey on January 12, 2016. Turkish police have sealed off central Istanbul square in historic Sultanahmet district after the explosion was heard. Ambulances raced to the scene in the minutes after the explosion. (Photo by Arif Hudaverdi Yaman/Anadolu Agency/Getty Images)
ISTANBUL, TURKEY - JANUARY 12: A dead body lies on the ground as police secure the area after an explosion in the central Istanbul Sultanahmet district on January 12, 2016 in Istanbul, Turkey. At least 10 people have been killed and 15 wounded in a suicide bombing near tourists in the central Istanbul historic Sultanahmet district, which is home to world-famous monuments including the Blue Mosque and the Hagia Sophia. Turkish President Erdogan has stated that the suicide bomber was of Syrian origin. (Photo by Can Erok/Getty Images)
EDITORS NOTE: Graphic content / Emergency responders work beside victims at the site of a blast in Istanbul's Sultanahmet district, the city's main tourist hub, on January 12, 2016. Ten people were killed and 15 wounded in a suspected terrorist attack on January 12 in the main tourist hub of Turkey's largest city Istanbul, officials said. A powerful blast rocked the Sultanahmet neighbourhood which is home to Istanbul's biggest concentration of monuments and and is visited by tens of thousands of tourists every day. / AFP / STR (Photo credit should read STR/AFP/Getty Images)
Police and media gather in front of the Blue Mosque at the historic Sultanahmet district after an explosion in Istanbul, Tuesday, Jan. 12, 2016. An explosion in a historic district of Istanbul popular with tourists killed 10 people and injured 15 others Tuesday morning, the Istanbul governor's office said. (AP Photo/Lefteris Pitarakis)
Security members evacuate people from the area near the city's landmark Sultan Ahmed Mosque or Blue Mosque shortly after an explosion at Istanbul's historic Sultanahmet district, which is popular with tourists, Tuesday, Jan. 12, 2016. The Istanbul governor's office said the explosion at the city's historic Sultanahmet district has killed least 10 people. A statement says 15 other people were injured in Tuesday's blast. The cause of the explosion is under investigation, but state-run TRT television says it was likely caused by a suicide bomber. (IHA via AP) TURKEY OUT
Policemen secure an area at the historic Sultanahmet district, which is popular with tourists, after an explosion in Istanbul, Tuesday, Jan. 12, 2016. The private Dogan news agency says at least two people were hospitalized following an explosion in the historic center of Istanbul. (AP Photo/Lefteris Pitarakis)
ISTANBUL, TURKEY - JANUARY 12: Ambulances and police were despatched to the blast site after an explosion in the central Istanbul Sultanahmet district on January 12, 2016 in Istanbul, Turkey. At least 10 people have been killed and 15 wounded in a suicide bombing near tourists in the central Istanbul historic Sultanahmet district, which is home to world-famous monuments including the Blue Mosque and the Hagia Sophia. Turkish President Erdogan has stated that the suicide bomber was of Syrian origin. (Photo by Can Erok/Getty Images)
ISTANBUL, TURKEY - JANUARY 12: Emergency services attend the scene after an explosion in the central Istanbul Sultanahmet district on January 12, 2016 in Istanbul, Turkey. At least 10 people have been killed and 15 wounded in a suicide bombing near tourists in the central Istanbul historic Sultanahmet district, which is home to world-famous monuments including the Blue Mosque and the Hagia Sophia. Turkish President Erdogan has stated that the suicide bomber was of Syrian origin. (Photo by Elif Sogut/Getty Images)
Policemen secure an area at the historic Sultanahmet district, which is popular with tourists, after an explosion in Istanbul, Tuesday, Jan. 12, 2016. The private Dogan news agency says at least two people were hospitalized following an explosion in the historic center of Istanbul. (AP Photo/Lefteris Pitarakis)
Turkish police cordon off the Blue Mosque area on January 12, 2016 after a blast in Istanbul's tourist hub of Sultanahmet left 10 people dead. Ten people were killed and 15 wounded in a suspected terrorist attack on January 12 in the main tourist hub of Turkey's largest city Istanbul, officials said. A powerful blast rocked the Sultanahmet neighbourhood which is home to Istanbul's biggest concentration of monuments and and is visited by tens of thousands of tourists every day. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
ISTANBUL, TURKEY - JANUARY 12: Ambulances gather around Sultanahmet tourist district after an explosion in Istanbul, Turkey on January 12, 2016. Turkish police have sealed off central Istanbul square in historic Sultanahmet district after the explosion was heard. Ambulances raced to the scene in the minutes after the explosion. (Photo by Veli Gurgah/Anadolu Agency/Getty Images)
Policemen search for evidence at the historic Sultanahmet district after an explosion in Istanbul, Tuesday, Jan. 12, 2016. An explosion in a historic district of Istanbul popular with tourists killed 10 people and injured 15 others Tuesday morning, the Istanbul governor's office said. (AP Photo/Lefteris Pitarakis)
Turkish security members stand near the city's landmark Sultan Ahmed Mosque or Blue Mosque after an explosion at Istanbul's historic Sultanahmet district, which is popular with tourists, on Tuesday, Jan. 12, 2016. The cause of the explosion, which could be heard from several neighborhoods, was not immediately known but TRT said the blast was likely caused by a suicide bomber. Government officials immediately convened for a security meeting, the state-run station said. (IHA via AP) TURKEY OUT
Policemen secure the historic Sultanahmet district after an explosion in Istanbul, Tuesday, Jan. 12, 2016. An explosion in a historic district of Istanbul popular with tourists killed 10 people and injured 15 others Tuesday morning, the Istanbul governor's office said. (AP Photo/Emrah Gurel)
ISTANBUL, TURKEY - JANUARY 12: Ambulances and police were despatched to the blast site after an explosion in the central Istanbul Sultanahmet district on January 12, 2016 in Istanbul, Turkey. At least 10 people have been killed and 15 wounded in a suicide bombing near tourists in the central Istanbul historic Sultanahmet district, which is home to world-famous monuments including the Blue Mosque and the Hagia Sophia. Turkish President Erdogan has stated that the suicide bomber was of Syrian origin. (Photo by Can Erok/Getty Images)
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The U.S. Embassy emailed what it called an "emergency message" to Americans.

"The U.S. Mission in Turkey would like to inform U.S. citizens that there are credible threats to tourist areas, in particular to public squares and docks in Istanbul and Antalya," it said in the statement. "Please exercise extreme caution if you are in the vicinity of such areas."

Two Reuters reporters in central Istanbul saw an extremely heavy police presence, with roads sealed off near the Hilton hotel. Armed special police units were deployed outside foreign consulates in Istanbul, including the German and Italian missions.

Last month's attack in Istanbul's main shopping district killed three Israelis, two of whom held dual citizenship with the United States, and one Iranian. A separate attack in the city's historic heart in January killed 12 German tourists.

Turkey is facing multiple security threats. As part of a U.S.-led coalition, it is fighting Islamic State in neighboring Syria and Iraq. It is also battling Kurdish militants in its southeast, where a 2-1/2-year ceasefire collapsed last July, triggering the worst violence since the 1990s. (Reporting by Ayla Jean Yackley and Nick Tattersall; Writing by David Dolan; Editing by Mark Heinrich)

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