The UN says nearly 100,000 people have fled clashes in South Sudan, between supporters of President Salva Kiir and those of his opponent, former deputy president Riek Machar.

The UN's aid chief in South Sudan, Toby Lanzer, said the conflict had resumed in the oil-rich Unity state, despite a ceasefire deal signed by the rivals in January.

The conflict, which began in 2013, has left over 10,000 dead and another 1.5mn displaced.

Clashes with an armed group have left at least five police officers dead in Kumanovo, northern Macedonia.

The armed group, from an unidentified neighbouring state, was armed with bombs and automatic rifles, interior ministry spokesperson Ivo Kotevski said, adding that members of the group were sheltered by some residents in the Diva Naselba neighbourhood.

International inspectors in Syria have found undeclared traces of sarin and VX nerve agent at a military research site, reports Reuters.

The US has launched an investigation into Baltimore’s police department, in order to determine whether it engages in routine bias or uses excessive force, the BBC reports.

Mayor Stephanie Rawlings-Blake requested the inquiry by the justice department after the death of Freddy Gray, an unarmed black man who died after his arrest, which sparked days of protests.