Cease-fire declared after deadly clashes

UN chief calls for immediate arms embargo and appeals to Security Council for targeted sanctions

South Sudan's president and his estranged deputy ordered a cease-fire on Monday after a new day of heavy fighting in the capital that sent thousands fleeing and threatened a return to civil war.

President Salva Kiir's cease-fire order on Monday evening was followed by a similar call from ex-rebel and Vice-President Riek Machar, raising hopes of an end to three days of deadly fighting between the army and former rebels in the world's youngest nation.