NIONO, Mali -- Islamist rebels withdrew from their forward positions on both of Mali’s war fronts Friday, an apparent sign that they’ll be shifting tactics after heavy French aerial bombardment pounded their positions even in civilian residential areas.

The Malian military announced that it had regained control of Konna, the city whose fall last week prompted the French to send troops and air power to the West African nation.

The Islamists also pulled out of the town of Diabaly, which they’d taken Monday, after days of intense aerial bombardment. Malian troops were expected to occupy the town Friday night.

Residents fleeing Diabaly said they never saw any ground combat or French soldiers but that the air attack included jets and helicopters. Both officially and privately, local authorities said that as far as they knew, there’d been no ground attack on Diabaly.

“Diabaly is free. There is not even a single rebel in Diabaly,” said Seydou Traore, the prefect of the Niono region, which includes Diabaly. “I don’t know if it is a tactical withdrawal or if they ran away. There was no ground fighting."

In Paris, a French military spokesman said the rebels abandoned Konna after a fierce aerial campaign that included 70 airstrikes. But the spokesman, Col. Thierry Burkhard, did not acknowledge the withdrawal from Diabaly, perhaps signaling the suddenness of the rebel departure. “There has been no action in Diabaly,” he said.

Burkhard said that French troops had not engaged in close combat with the Islamists. “Only the French special forces have been in contact” with the enemy, primarily from the air, he said. There had been “no real fighting,” he added.

He said French troops were continuing to arrive in Bamako, the country’s capital, nearly 200 miles to the south of Niono, and that a company of French soldiers had been sent to Markala, about 160 miles north of the capital, both to guard a crucial dam there and to serve as a blocking force should the Islamists attempt to move toward Bamako.

The rebels’ push southward 10 days ago from the harsh Sahara Desert, which composes most of northern Mali, into the lush green lands of central Mali, where rice paddies and eucalyptus plantations irrigated by the Niger River dominate, had surprised Mali’s government, which feared the Islamists’ advance soon might include Bamako. Mali’s president quickly asked the United Nations and France for help, and French troops began arriving in this former French colony a week ago.

A French bombing campaign failed, however, to dislodge the Islamists from Konna, the town on the eastern bank of the Niger River that the Islamists had captured Jan. 9. Then on Monday, the rebels opened a front on the western side of the river, taking Diabaly in a two-pronged attack that routed the Malian garrison. Malian troops at other outposts in the area also withdrew, allowing the Islamists to expand their presence to the abandoned towns.

It was unknown whether all those gains had been ceded to the French-backed Malian government Friday or whether some rebels had remained behind. Nor was it immediately clear whether the rebel withdrawal from both positions was coordinated.

What precipitated the withdrawal was the subject of rumor. Reports swirled among Diabaly townspeople that the rebels’ sudden withdrawal came after French aircraft bombed a truck piled with rebel corpses that was heading to the cemetery. The truck was obliterated, incinerating the corpses, now denied a proper Muslim burial. Then the rout began, said residents pouring into Niono. No one, however, claimed to have seen the incident personally.