Battle over the Libyan capital's airport that has killed about 50 people.
Told parents that government is doing all it can to secure their relase.
Nigeria's president has accused activists of "playing politics."
Presses for more action to free at least 200 girls held by Boko Haram.
Militia's shelling attack destroyed 90% of planes parked there.
Flights have been suspended amid reports of heavy shelling and gunfire.
More than 60 women escaped when Nigerian group went to attack base.
Islamist militants had forced their way into the compound.
Fuel storage site in Tripoli was hit by rocket during militia clashes.
Rival groups signed deal aimed at ending over a year of conflict.
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