The humanitarian corridor in the Ukrainian city of Sumy will open on Tuesday, and civilians could start leaving on buses at 0800 GMT, Ukrainian Deputy Prime Minister Iryna Vereshchuk said. 

"It has been agreed that the first convoy will start at 10 a.m. (0800 GMT) from the city of Sumy. The convoy will be followed by the local population in personal vehicles," she said in a televised statement.

(With input from Reuters)