( CNN ) -- Security was tightened in and around Kabul on Sunday with 7,000 additional police officers deployed ahead of Monday 's 89th observance of Afghanistan 's independence from Great Britain . An Afghan policeman stops a vehicle at a checkpoint in Kabul , where security has been tightened . Police were seen at newly established security checkpoints looking at every passing vehicle Sunday . Increased foot patrols were also apparent . An Interior Ministry official said it was the biggest police operation in Kabul in several months . Also on Sunday , dozens of Taliban militants were killed after they ambushed a convoy carrying supplies for NATO forces in southern Afghanistan , an Afghan official said . Five security forces who worked for a private company were killed in the attack , in Zabul province , said Gulab Shah Alikhail , the deputy governor . After the ambush , Afghan army forces were called in , Alikhail said . Alikhail put the militants ' death toll at 32 . On Saturday , a roadside bomb killed 10 Afghan police officers in Kandahar province , according to Police Chief Matiullah Khan . Khan blamed the Taliban and their al Qaeda associates for the attack . `` Who else is conducting this kind of cowardly acts except for the Taliban and al Qaeda people , '' he said .
Extra police deployed around Kabul ahead of independence celebrations . Dozens of Taliban militants killed Sunday after convoy ambushed . Roadside bomb kills 10 Afghan police officers in Kandahar province . Official blames Taliban and al Qaeda associates for attack on police .