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Separatist fighters in east Ukraine continue shelling campaign to capture key airport

  • Smoke rises over the Svyato-Iversky Women's Monastery during artillery battle near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014.  Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting .  (AP Photo/Dmitry Lovetsky)

    Smoke rises over the Svyato-Iversky Women's Monastery during artillery battle near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014. Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting . (AP Photo/Dmitry Lovetsky)  (The Associated Press)

  • Pro-Russian rebels fire toward Ukrainian positions near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014.  Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting . (AP Photo/Dmitry Lovetsky)

    Pro-Russian rebels fire toward Ukrainian positions near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014. Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting . (AP Photo/Dmitry Lovetsky)  (The Associated Press)

  • Alexander holds keys of his burned cars at his destroyed house after shelling near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014.  Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting . (AP Photo/Dmitry Lovetsky)

    Alexander holds keys of his burned cars at his destroyed house after shelling near to the airport in the town of Donetsk, eastern Ukraine Tuesday, Oct. 7, 2014. Despite a cease-fire declared a month ago between the Ukrainian forces and pro-Russian rebels, the biggest city in eastern Ukraine remains embroiled in fighting . (AP Photo/Dmitry Lovetsky)  (The Associated Press)

Defense officials in Ukraine say there has been no letup in efforts by pro-Russia separatist fighters in the east to capture the airport in the main rebel-held city of Donetsk.

Security spokesman Andriy Lysenko said Tuesday that rebels fired on the terminal from tanks, artillery systems and multiple rocket launchers.

A cease-fire that nominally came into effect one month ago has been routinely flouted, with substantial shelling concentrated in the area around Donetsk airport. Fighting has also been reported in numerous other parts of the Donetsk region.

Residential buildings are frequently hit as a result of the shelling duels. Donetsk city authorities say four civilians were killed Monday.

Rebels and government officials regularly trade accusations over who is responsible for the civilian deaths.