(AGI) Tripoli, July 13 - Heavy fighting between militias brokeout near the airport of the Libyan capital, Tripoli, on Sundaymorning. Islamist militias attacked the rival Zintan group,which controls Libya's international airport in Tripoli,triggering violent clashes that stopped flights. An airportofficial said rockets had struck inside the airport perimeterearly in the morning. The former rebel militia from Zintan, ahill town southwest of the capital, is the main supporter ofliberals in parliament who are trying to resist attempts bypowerful Islamists to gain power. . .