United Nations, July 24 (Xinhua) Repeated attempts to overthrow the transitional Somali government are a source of deep concern, UN Secretary-General Ban Ki-moon has said, calling on the global community to help the volatile African nation.

The increase in attacks by insurgents comes 'at a time when the government is making concrete progress towards fulfilling its transitional agenda, which the population has increasingly welcomed', Ban said in a report on the situation in Somalia, released Thursday.

'The attempts by elements opposed to peace and stability to seize power by force from the legally constituted and internationally recognised government must not be allowed to succeed,' he said, adding that the authorities must be enabled to 'exercise its authority countrywide for the sake of the Somali people'.

Insurgent groups, such as Al-Shabaab, have stepped up their strategy to intimidate the Somali people, including through methods such as 'high gain' assassinations and arrests of clan elders, some of whom have been murdered.

On June 19, Omar Hashi Aden, the Somali minister of national security, was killed in a suicide car bomb attack in the Beletweyne area in central Somalia.

The Somali militants have also raided two UN compounds Monday, stealing equipments and vehicles, forcing one of its offices to close down.