A total of 14 Afghan police and soldiers have died over the last two days as Taliban insurgents increase attacks as part of their annual "spring offensive" launched last month.
The two attackers fled the police checkpoint after shooting the seven men in the province of Kandahar, a hotbed of the militant campaign that targets Afghan security forces and officials as well as US-led foreign forces.
"Two men asked police to let them spend the night in their post. The police accepted and gave them food," Jawed Faisal, spokesman for the Kandahar provincial governor, told AFP.
Ghorzang Afridi, a Kandahar police spokesman, said that the men escaped in a police jeep with several stolen weapons.
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"These men used to be police themselves but had abandoned their jobs, and at the post they said they wanted to join the police again," he said.
The Taliban claimed responsibility for the attack.
Yesterday night, five Afghan soldiers were killed in the northern province of Badakhshan in a militant assault, the ministry of defence said, while two other soldiers were killed in an explosion in Kandahar today.
Casualties among Afghan security forces have risen sharply in recent years as international coalition troops have begun to pull back and local personnel have taken over front-line duties.