NATO stepped up strikes on forces loyal to Col. Moammar Gadhafi Sunday, incinerating a convoy of vehicles laying siege to Ajdabiya and appearing to turn the tide toward rebel forces in the battle for control of the strategically vital city.

Meanwhile, a delegation of African leaders including South Africa's President Jacob Zuma arrived in Tripoli Sunday for talks with Col. Gadhafi as his troops stepped up their offensive in Ajdabiya.

The...