KABUL, Afghanistan — Authorities say a suicide bomber blew himself up at a border checkpoint entering Afghanistan from Pakistan, killing at least two people and wounding eight others.

Kandahar provincial government spokesman Javeed Faisal said the attacker detonated his explosives at midmorning at the gates of the Spin Boldak crossing into Afghanistan, which is used by thousands of people every day.

In addition to the suicide bomber, he says the blast killed one border police officer and wounded one, and killed one civilian and wounded seven others.

Border police say the officer killed was the checkpoint commander, and they assume he was the target.

There was no immediate claim of responsibility. Such attacks are usually the work of Islamic militants.