France's foreign minister says the United States is providing communications and transport help for an international military intervention aimed at wresting Mali's north out of the hands of Islamist extremists.

Laurent Fabius says Britain, Denmark, and other European countries also are helping.

Fabius said on RTL radio Sunday, "We have the support of the Americans for communications and transport." He didn't provide details.

U.S. officials on Saturday said they had offered to send drones to Mali.

The three-day-old French-led effort to take back Mali's north from the Al Qaeda-linked extremists has included airstrikes by jets and combat helicopters on at least four towns.

Troops from Mali's neighbors are expected to join hundreds of French soldiers in the battle.

Niger, Burkina Faso, Senegal and Nigeria agreed on Saturday to send soldiers, a day after France authorized airstrikes, dispatching fighter jets from neighboring Chad and bombing rebel positions north of Mopti, the last Malian-controlled town.

State television announced that the African troops, including as many as 500 each from Burkina Faso and Niger, are expected to begin arriving on Sunday. Britain has offered the use of its transport planes in order to help bring in the soldiers, according to a statement released by Prime Minister David Cameron's office in London.

The African soldiers will work alongside French special forces, including a contingent that arrived Saturday in Bamako in order to secure the capital against retaliatory attacks by the Al Qaeda-linked rebel groups occupying Mali's northern half. National television broadcast footage of the French troops walking single-file out of the Bamako airport on Saturday, weapons strapped to their bodies. Some carried them like skis, against their shoulder.

French Defense Minister Jean-Yves Le Drian said Sunday that France now has more than 400 troops in Bamako, mainly to ensure the safety of French citizens and also to send a signal to the extremists.

"We will strengthen our operation depending on the situation," he said on a political talk show with itele and Europe 1 radio. Le Drian said that Rafale fighter jets will be part of the operation and that technical support will be arriving in the hours ahead.

He said that France has international support and "the Americans seconded us" with intelligence and logistical support, though he did not elaborate.

Storage hangars and "sensitive sites" were among targets destroyed so far and the Islamists lost a "significant number" in the fighting, Le Drian said. "The intervention is still in progress and we will continue" as long as needed.

The military operation began Friday, after the fall of the town of Konna on Thursday to the Al Qaeda-linked groups. Konna is only 30 miles north of the government's line of control, which begins at the town of Mopti, home to the largest concentration of Malian troops in the country.

The United Nations had cautioned that a military intervention needed to be properly planned, and outlined a step-by-step process that diplomats said would delay the operation until at least September of this year.

The rebels' decision to push south, and the swift fall of Konna, changed everything. After an appeal for help from Mali's president, French President Francois Hollande sent in the Mirage jets and combat helicopters, pounding rebel convoys and destroying a militant base. Footage of the jets provided to French television stations showed the triangle-shaped aircrafts screaming across the sky over northern Mali. French newspaper Le Monde reported that the jets dropped at least two, 550-pound bombs over militant targets.

The human toll has not yet been calculated, but a communique read on state television late Saturday said that at least 11 Malians were killed in Konna.

Sory Diakite, the mayor of Konna, says the dead included children who drowned after they threw themselves into a river in an effort to escape the bombardments.

"Others were killed inside their courtyards, or outside their homes. People were trying to flee to find refuge. Some drowned in the river. At least three children threw themselves in the river. They were trying to swim to the other side. And there has been significant infrastructure damage," said the mayor, who fled the town with his family and is now in Bamako.

Human rights groups have warned that any military intervention will exact a humanitarian price. The nation of Mali, and the international community, found itself in a Catch-22 because every passing week that the intervention was delayed has allowed the rebels affiliated with Al Qaeda to dig into the terrain, and prepare for war. The rebels occupied Mali's northern half, an area larger than Afghanistan, in the chaos following a coup in Mali's capital last March.

With no clear leader at the head of the country, Mali's military simply gave up when the rebels arrived, retreating hundreds of miles to the south without a fight. In the nine months since then, the extremists have imposed their austere and severe form Islam, and those who disobey their rules are beaten with whips and camel switches. Public amputations of the hands of thieves have become a regular spectacle.

They have also used their nine-month siege of the north to dig into the landscape, creating elaborate defenses, including tunnels and ramparts using the construction equipment abandoned by fleeing construction crews.

In addition to the civilians, a French pilot was killed after the Islamists downed his combat helicopter, in a sign of how dangerous the terrain has become even for trained, special forces.