The Latest on attack on Istanbul airport (all times local):

10 a.m.

Turkey's state-run news agency says police have conducted a series raids in Istanbul neighborhoods, targeting Islamic State suspects following the gunfire and suicide bomb attack at Ataturk Airport which killed 42 people.

Anadolu Agency said police searched residences in Istanbul's Pendik, Basaksehir and Sultanbeyli neighborhoods but it was not clear if any arrests were made.

Authorities blamed the IS group for three assailants' coordinated attack late Tuesday on one of the world's busiest airports, that also injured more than 230.

There was no immediate claim of responsibility by the militant group.

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9:30 a.m.

A Turkish news report says security forces have killed two suspected Islamic State militants at the border with Syria.

Private NTV television said Thursday the two Syrian nationals "were neutralized" after they ignored security forces warnings, but provided no further details. It was not immediately clear if they were trying to cross illegally into Turkey.

NTV, without citing any sources, said one of the two militants was wanted by Turkey on suspicion that he would carry out suicide attacks in the capital Ankara or in the southern city of Adana.

The reported incident comes days after suspected IS militants attacked Istanbul's busiest airport with gunfire and bombs Tuesday, killing 42 people and wounding more than 230 others.