Heavy gunfire erupts in South Sudan's capital Juba

Heavy gunfire erupted in South Sudan's capital Juba on Thursday evening after security forces moved to arrest the former head of the intelligence service, according to Reuters reporters and an alert sent to United Nations staff.

The gunfire began about 7 p.m. local time (1700 GMT) and continued sporadically for more than an hour before dying down, Reuters reporters said.

A U.N. safety alert to staff members in Juba, seen by Reuters, said the shooting was related to the arrest of the former head of the National Security Service, or NSS. It urged U.N. staff to shelter in place.

In early October, President Salva Kiir dismissed Akol Koor Kuc, who had led the NSS since the country's independence from Sudan in 2011, and he appointed a close ally to replace him.

Reached by telephone, a military spokesperson said he was trying to establish what was going on.

Analysts said the sacking of Akol Koor reflected a power struggle at the highest levels of government. It came weeks after the transitional government that Kiir leads announced that elections expected in December would be postponed for a second time.