The Gambia’s security forces have taken over the headquarters of the Electoral Commission following disputed elections, its chairman says.
Alieu Momar Njai told the BBC that security forces were stopping staff from entering.
President Yahya Jammeh initially conceded defeat to Adama Barrow in a recent poll, before changing his mind.
West African leaders have arrived in the country to try to persuade Mr. Jammeh to step down peacefully.
The head of regional bloc Ecowas, Marcel de Souza, would not rule out sending in troops.
“We have done it in the past,” he told Radio France Internationale.
“We currently have troops in Guinea-Bissau with the Ecomib mission. We have had troops in Mali. And therefore it is a possible solution.”