BAMAKO/PARIS French troops launched their first ground operation against Islamist rebels in Mali on Wednesday in a crucial action to dislodge Al-Qaeda-linked fighters who have resisted six days of air strikes. France called for international support against Islamist insurgents it says are a threat to Africa and the West and acknowledged it faced a long fight against well-equipped and determined militant fighters who seized Mali's vast desert north last year. A column of French armoured vehicles moved into position on Tuesday at the town of Niono, 300 km (190 miles) from the capital Bamako. With the Malian army securing the northern region near the Mauritanian border, Islamist fighters were encircled in the nearby town of Diabaly. French army chief Edouard Guillaud said his ground forces were starting their campaign against the alliance of Islamist fighters, grouping Al-Qaeda's North African wing AQIM with Mali's home grown Ansar Dine and MUJWA militant movements. “In the coming hours – but I cannot tell you if it's in one hour or 72 hours – yes, of course we will be fighting them directly,” he told Europe 1 radio. In Niono, a resident reported seeing French and Malian troops in armoured vehicles heading toward Islamist rebel lines. Fighting was reported in Diabaly but it was not immediately clear if French ground forces were involved. Guillaud said French military strikes were being hampered because militants were using the civilian population as a shield. “We categorically refuse to make the civilian population take a risk. If in doubt, we will not shoot,” he said. Residents who fled Diabaly confirmed the Islamists had used the town's inhabitants to protect themselves in recent days. French fighter jets, meanwhile, struck the headquarters of the Islamic police in Niafunke, a small town on the Niger River near the ancient caravan route of Timbuktu, residents said. Defense Minister Jean-Yves Le Drian acknowledged that France faced a difficult operation, particularly in Western Mali where AQIM's mostly foreign fighters have camps. Mauritania has pledged to close its porous frontier to the Islamists. “It's tough. We were aware from the beginning it would be a very difficult operation,” Le Drian said. President Francois Hollande said on Tuesday French forces would remain in Mali until stability returned to the West African nation. Hollande said France hoped, however, to hand over to African forces in its former colony, “in the coming days or weeks.” Military chiefs from the West African regional bloc ECOWAS met for a second day in Bamako on Wednesday in a bid to hammer out the details of their UN-mandated deployment. With African troops facing huge logistical and transport challenges to quickly deploy their troops, Germany promised two Transall military transport planes to fly soldiers from around the region to Bamako. Hollande's bold intervention in Mali, which has helped to end his reputation for dithering, brings risks for eight French hostages held by AQIM in the Sahara as well as the 30,000 French citizens living across West Africa. AQIM and Ansar Dine have vowed to take revenge for France's intervention on its interests around the globe. In Senegal, a traditionally moderate Islamic country, President Macky Sall warned citizens to be vigilant for attacks. “We must be on the watch in our towns and villages because infiltrations are taking place,” he said in a speech on Tuesday. “You will hear foreign preachers talking in the name of Islam. You must denounce them to authorities.” The fighting in Mali, a landlocked state at the heart of West Africa, has displaced an estimated 30,000 people. – Reuters