AFRICA, July 31 (Aljazeera) - West African countries have imposed sanctions on Niger’s new military leaders, threatening to use force if they fail to reinstate ousted President Mohamed Bazoum within a week, after the latest coup in the Sahel region raised alarm on the continent.

In the third coup in as many years to topple a leader in the Sahel, Niger’s elected president and Western ally, Bazoum, has been held by the military since Wednesday.

General Abdourahmane Tiani, the head of the powerful presidential guard, has declared himself leader.

Bazoum is one of a dwindling group of elected presidents and pro-Western leaders in the Sahel, where since 2020 an armed uprising has triggered coups in Mali and Burkina Faso.

Former colonial ruler France and the European Union have suspended security cooperation and financial aid to Niger following the coup, while the United States warned that its aid could also be at stake.

At an emergency summit in Nigeria, the 15-nation Economic Community of West African States (ECOWAS) regional bloc demanded on Sunday that Bazoum be reinstated within a week.

Otherwise, the bloc said it would take “all measures” to restore constitutional order.

“Such measures may include the use of force for this effect,” it said in a statement, adding that ECOWAS defence chiefs were to meet later on Sunday.

It was not immediately clear how ECOWAS could use force. Last year, the bloc agreed to create a regional security force to intervene against armed group members and prevent military coups, but details on the force and its funding were still unclear.

The bloc also slapped financial sanctions on the coup leaders and the country, freezing “all commercial and financial transactions” between member states and Niger, one of the world’s poorest nations, often ranking last on the United Nations’ Human Development Index.

In a statement read out on national television on Saturday evening, Niger military government member Amadou Abdramane said the summit’s aim was to “approve a plan of aggression against Niger, in the form of an imminent military intervention in Niamey”.

The intervention would be “in cooperation with African countries who are not members of the regional body and certain Western nations”, he added.

The president of Chad, General Mahamat Idriss Déby Itno, was in the Nigerien capital, Niamey, on Sunday as part of an attempt to help resolve the crisis, Chad government spokesman Aziz Mahamat Saleh told the AFP news agency. He said the trip was on the initiative of Chad.