BAKU, Azerbaijan, Sept. 11 (UPI) -- Five Armenian soldiers have been killed in Azerbaijan's Nagorno Karabakh region in an apparent cease-fire violation, Azeri media reported.

The BBC said Friday while three Azeri news agencies reported deadly fighting in the disputed region, the conflict and reported Armenian deaths had not been confirmed by Azerbaijan.

Azerbaijan and Armenia remained divided over control of the Nagorno Karabakh region of the South Caucasus since fighting over the region erupted in the 1990s. Since that violence ended in 1994 with a cease-fire, the region has been the site of multiple shootings.

An anonymous official confirmed to the BBC that gunfire had occurred in the region resulting in casualties. Specifics regarding the violence were not reported.

Meanwhile, Karabakh Defence Ministry spokesman Senor Hasratian denied the Azeri news reports of fatalities, but did confirm gunfire took place in the region overnight.

The BBC said negotiations for a solidified cease-fire agreement between Armenia and Azerbaijan are ongoing.