Three civilians have been killed by shelling by pro-Russian rebels in Ukraine's separatist eastern regions, the Ukrainian military said on Saturday, following a week of the deadliest fighting in over a month, Reuters reported. One Ukrainian serviceman was also killed and four others were wounded, military spokesman Andriy Lysenko said in a televised briefing. The rebels in turn accused Ukrainian forces of intensifying attacks and firing at civilian areas. More than 6,500 people have been killed since the conflict broke out in eastern Ukraine in April last year. Attacks have lessened since a peace agreement was brokered in Minsk, Belarus, five months ago, but both sides accuse each other of violations.