Leaders and representatives from six member states of the Southern African Development Community (SADC) yesterday resolved to send investigators to the tiny mountain nation after emergency talks over the crisis sparked by the killing of Brigadier Maaparankoe Mahao.
Mahao, who was aligned with former prime minister Thomas Thabane, was shot and killed late last week, reportedly by a group of soldiers.
His killing comes two months after Thabane -- now head of the opposition -- fled Lesotho, claiming he was the target of an assassination plot.
The investigators will be drawn from select countries in the 15-member SADC grouping.
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South Africa's President Jacob Zuma, who is head of the regional bloc's security committee, said the killing of the army ex-commander had thrown the kingdom into a "serious security crisis".
Yesterday's summit also urged the Lesotho government to "urgently" undertake constitutional and security reforms.
Last August, Thabane fired then army chief Tlali Kamoli, replacing him with Mahao. The next day soldiers attacked police headquarters, looting weapons and killing one officer.
SADC instructed both Mahao and Kamoli to leave the country in the run-up to a snap election in February, which brought a new coalition government to power headed by Thabane's predecessor, Pakalitha Mosisili.
Kamoli was reinstated as army chief after the election.
Completely landlocked by South Africa, Lesotho is one of the world's poorest countries and is no stranger to political upheaval.
The SADC leaders also created a special panel that would act as early warning mechanism to watch out for signs of instability and intervene appropriately.