At least eight people have been killed in renewed fighting between pro-government forces and armed fighters in the Somali capital, Mogadishu.
Witnesses said gunfire could be heard in the north of Mogadishu as fighters exchanged fire with government forces on Wednesday.
Mogadishu has seen intense fighting since the weekend as fighters from the al-Shabab group seek to topple Sharif Ahmed, the Somali president, and his government.
The clashes have prompted thousands of Mogadishu residents to flee the city.
Ali Sheik Yasin Fadhaa, the vice-chairman of the local Elman Human Rights Organisation, said: "Some of them do not know where to go. They need urgent help."
While vowing to defend his government, Sharif Ahmed has endorsed plans to introduce Islamic law, a key demand by the fighters for their co-operation with his administration.
However, several armed groups such as al-Shabab and Hizbul Islam have refused to hold talks with him, saying Sharif Ahmed is too close to the West.
Years of conflict in Somala has killed tens of thousands, displaced millions and created a security vacuum that has spawned piracy in the Gulf of Aden.