West African leaders at an emergency summit on Sunday agreed on a 3,300-strong force to wrest control of northern Mali from Islamist extremists as fears grow over risks they pose to the region and beyond.

The summit in the Nigerian capital Abuja was aimed at setting out a blueprint for military force in Mali's north that would be transferred to the UN Security Council via the African Union.

Leaders from the 15-nation Economic Community of West African States stressed that dialogue remained the preferred route to resolve the crisis in Mali's north, but said force might be necessary given the extremist threat there.

African nations and the international community have expressed growing concern over a continued occupation of Mali's north since it could provide a safe haven to Al Qaeda-linked extremist groups and criminal gangs.

"We foresee 3,300 soldiers for a timeframe of one year," Ivory Coast President Alassane Ouattara, the current ECOWAS chairman, told journalists after the summit.

The troops would come primarily from ECOWAS, but possibly from countries outside the bloc as well, he said.

Discussions also covered the possibility of training of 5,000 Malian troops, according to Ouattara.

Ouattara said he hoped UN Security Council approval could come in late November or early December, allowing the force to be put in place days afterward.

"We have countries that are offering battalions, others companies," he said.

ECOWAS countries he named were Nigeria, Senegal, Niger, Burkina Faso, Ghana and Togo.

From outside of ECOWAS, "Chad could also participate. We have had contacts with other countries -- Mauritania, South Africa."

The summit's final communique stressed that dialogue remained "the preferred option in the resolution of the political crisis in Mali."

"However, regarding the security situation, recourse to force may be indispensable in order to dismantle terrorist and transnational criminal networks that pose a threat to international peace and security," it said.

An ECOWAS source had said earlier that regional military chiefs were proposing a total of 5,500 troops, with some 3,200 from the West African bloc and the rest from elsewhere.

It was not clear whether heads of state had rejected the proposal or if the bloc would continue efforts to reach that level.

Algeria, seen as important to any military operation, has been hesitant to get involved, preferring a negotiated solution.

While not a member of ECOWAS, Algeria is viewed as key due to its superior military capabilities, intelligence services and experience battling Islamist extremism, along with the long border it shares with Mali.

Representatives from countries outside ECOWAS were invited to Sunday's summit, including from Mauritania and Algeria, as well as South Africa and Morocco, which currently hold seats on the UN Security Council. Chad was also represented.

The ECOWAS military strategy was drawn up with the help of experts from the European Union, the African Union, United Nations and the region, which is also seeking logistical support from elsewhere.

Foreign and defence ministers from five European countries -- France, Germany, Italy, Poland and Spain -- are expected to meet next Thursday to discuss a European mission to train Malian troops.

Mali rapidly imploded after a coup in Bamako in March allowed Tuareg desert nomads, who had relaunched a decades-old rebellion for independence, to seize the main towns in the north with the help of Islamist allies.

The secular separatists were quickly sidelined by the Islamists, who had little interest in their aspirations for an independent homeland and set about implementing their version of strict sharia law, meting out punishments including stonings and destroying World Heritage shrines.

Sunday's summit also saw the leaders review the situation in chronically unstable Guinea-Bissau, where a 638-strong west African force has deployed.

It replaced a contingent of Angolan troops whose presence in the country was strongly opposed by the military, prompting an army junta to overthrow the government of Carlos Gomes Junior on April 12.

Possible participating nations in Mali intervention
Abuja (AFP) Nov 11, 2012 - West African plans to take back control of northern Mali, held for over seven months by armed Islamist groups, could see the mobilisation of some 5,500 soldiers, essentially but not totally drawn from the region.

Between 200 and 400 European soldiers will train troops in Mali, according to the operational plan.

TROOPS ON GROUND: The 15-nation Economic Community of West African States (ECOWAS) wants to deploy 5,500 soldiers of which 3,200 would be drawn exclusively from member states as originally envisaged. The additional 2,300 would be supplied by non-ECOWAS nations on the continent.

AFRICAN MILITARY CONTINGENTS (as of November 11): Majority of the troops will be from Mali, under a Malian commander, ande the force headquarters will be based near the country's capital, Bamako.

- Burkina Faso will send around 150 troops.

- Niger could contribute between 600 and 900 soldiers.

- Other African countries outside ECOWAS -- such as South Africa -- could also take part but no decision has yet been taken.

DRAWBACKS: Ivory Coast, which chairs the regional body, has UN troops on its soil, and Senegal, which has contributed to other military missions, have so far declined sending troops to Mali.

- Two other Mali neighbours -- Mauritania and Algeria, not ECOWAS members -- are deeply opposed to a military intervention in Mali and have indicated they will not send troops, saying that they preferred dialogue.

- Nigeria, the military powerhouse in ECOWAS, is currently battling its own Islamist insurgency in the north and centre of Africa's most populous nation.

WESTERN POWERS SUPPORT: A European training mission in Mali is likely to consist of 200 to 400 European soldiers who are not charged with fighting. To the trainers will be added an unspecified number of soldiers to protect the force, according to the French defence ministry.

A French military source said that soldiers drawn essentially from the special forces of France, Germany, Italy, Poland and Spain would constitute the contingent.

France's special forces have been operating in the Sahel region since French nationals were first taken hostage there more than two years ago.

POSSIBLE AERIAL ATTACKS: The United States, which has means of aerial satellite surveillance in the zone, has considered the possibility of drone attacks against Al-Qaeda in the Islamic Maghreb (AQIM), according to reports in US media.

France, which has two Harfang drones, affirmed last month that there were "no drones in the Sahel region."