A bomb planted on a roadside Tuesday wounded at least 22 people in Pakistan’s southwestern Baluchistan province, police and hospital officials said.

A bomb planted on a roadside Tuesday wounded at least 22 people in Pakistan's southwestern Baluchistan province, police and hospital officials said.

The bomb went off near a market in Quetta where a lot of people were shopping ahead of the country's Independence Day on August 14.

"The bomb was detonated with a timer and was planted near a small roadside stall, Quetta police chief Abdul Razzak Cheema told AFP.

Hospital officials said 22 people were wounded.

"We have received 22 injured, two of them are in serious condition," doctor Rasheed Jamali at Civil Hospital said.

The blast shattered the window glass of several shops, witnesses said.

No group has yet claimed responsibility for the attack.