Officials expressed cautious optimism on the chances for peace in southwestern Africa on Friday after a ninth round of U.S.-mediated talks involving Cuba, Angola and South Africa.

South African delegation leader Neil van Heerden told reporters after a day of meetings between the three parties, with U.S. mediator Chester Crocker and with a Soviet official, that no concrete progress had been made.Cuban and South African sources said, however, that an apparent stalemate that halted the peace talks for six weeks appeared to be over.