Dozens were killed after three suicide bombers blew themselves up at Turkey's largest airport, Istanbul Ataturk, on Tuesday.
At least 36 have died, according to Turkish Prime Minister Binali Yildirim. The Turkish Press Officetweeted Yildirim's remarks on Tuesday night.
"Air traffic has returned to normal at Ataturk Airport," the prime minister added.
Yildirim said that police officers and foreign nationals are "among those wounded" in the attack, which occurred at around 10 p.m. local time and appeared to be coordinated and which left more than 100 others injured.
The Associated Press said that initial indications suggest that ISIS is responsible for the attack.
"The assessments show that three suicide bombers carried out the attacks in three different spots at the airport," Vasip Şahin, Istanbul Province's governor, said.
The suspects apparently detonated the explosives at the security check-in at the entrance to the airport's international terminal as they exchanged gunfire with police, a Turkish official told Reuters.
Turkish Justice Minister Bekir Bozdag said that at least one of the attackers opened fire on the crowd using a Kalashnikov rifle before detonating himself.
It is still unconfirmed who is responsible for the attack, but ISIS and Kurdish groups have claimed multiple attacks in Turkey in the last year. The Kurdistan Workers' Party (PKK) is waging an insurgency against the Turkish government, but primarily targets military and security personnel in the country's southeast.
The Ataturk attack "fits the ISIS profile, not PKK," a counterterrorism official told CNN, adding that the PKK doesn't usually go after international targets.
Ataturk is the 11th-busiest airport in the world, with at least 61 million travelers passing through in 2015. Many have noted that Turkey had assigned extra security to the entrance of Ataturk in the wake of numerous ISIS-linked terrorist attacks in Istanbul in the past several months.
Lisa Monaco, assistant to the US president for homeland security and counterterrorism, has briefed US President Barack Obama on the attack, according to a White House official.
The White House released an official statement Tuesday evening, likening the attacks to the ones at Brussels Airport earlier this year and calling it "a symbol of international connections and the ties that bind us together."
The statement continued, "We remain steadfast in our support for Turkey, our NATO Ally and partner, along with all of our friends and allies around the world as we continue to confront the threat of terrorism."
The US State Department renewed its three-month-old travel warning for Turkey on Monday, noting that "Foreign and US tourists have been explicitly targeted by international and indigenous terrorist organizations," in a warning posted on the department's website.
The US consulate is working to determine if US citizens are among the airport attack's victims, the State Department tweeted.
