The bomber was
spotted by police as his car approached the checkpoint,
prompting him to detonate his explosives, the spokesman said.
There was no immediate claim of responsibility.
The blast follows a series of attacks in the Afghan capital over
recent days, including a suicide attack on a restaurant popular
with foreigners and wealthy Afghans which killed a 12 year-old
boy and a security guard.
The attacks have coincided with a new effort to restart peace
talks with the Taliban after earlier meetings were broken off
last July.
(Reporting by Mirwais Harooni; Writing by James Mackenzie;
Editing by Nick Macfie)
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