QUETTA: A bomb planted on a bicycle exploded in the Pakistani city of Quetta on Monday, killing two people, including an Afghan refugee girl, and wounding more than a dozen, police said.   

Quetta is the capital of the gas-rich southwestern province of Baluchistan where nationalist tribal militants have been waging a low-level insurgency for autonomy and a greater share of the profits from natural resources for decades.   

The province, on the border with Afghanistan, is also home to many Afghan refugees. The Afghan government says Taliban insurgents also operate from the province.   

No one claimed responsibility for the bicycle bomb but Salman Sayed, deputy inspector general of provincial police, said it appeared to have connections "across the border in Afghanistan".

"The condition of two of the wounded people is critical, he said.