(CNN) -- A blast in Pakistan's tribal region bordering Afghanistan killed eight and injured at least 21 Thursday, according to a government spokesman.
A roadside bomb detonated in a village market of the volatile Bajaur Agency, said Akbar Khan, a government administrative official. It had been planted outside a store.
Bajaur is one of seven semi-autonomous tribal districts in northwest Pakistan.
There has been no claim of responsibility.
Journalist Aamir Iqbal contributed to this report.