PESHAWAR (Reuters) -- Pakistani forces attacked a Taliban stronghold with aircraft and artillery on October 16, as a suicide bomber killed 12 people in the city of Peshawar in the latest in a wave of militant attacks.
The government says a ground offensive against the Pakistani Taliban in their South Waziristan lair is imminent and the army has been stepping up its air and artillery attacks in recent days to soften up the militants' defenses.
The militants have launched a string of brazen attacks in the past 11 days, striking at the United Nations, the army headquarters, police and the general public, killing about 150 people, apparently trying to stave off the army assault.
The blast was outside an office of the police's Central Investigation Agency in the capital of North West Frontier Province, a staging post for U.S. supplies into neighboring Afghanistan.
"I was on the spot within minutes and helped remove bodies. They were really in bad shape," said resident Mohammad Rizwan.
Police said a woman appeared to have been involved in the attack, while provincial Information Minister Iftikhar Hussain said the bomber drove up to the police office.
"His leg has been found. It is not clear if it is of a man or a woman," Hussain told reporters, adding three policemen were among the dead.
A hospital official said 12 people had been killed. A nearby mosque was damaged and about a dozen people were wounded. Television showed anxious policemen wheeling bloodied colleagues into hospital.
The government says the militant attacks have only reinforced its determination to defeat its enemies.
Nuclear-armed Pakistan is under U.S. pressure to crack down on Islamist militancy as President Barack Obama considers a boost in troop numbers fighting in neighboring Afghanistan.
Aircraft and artillery struck militant positions in their strongholds of Ladha, Makeen, and in the mountainous Shahoor region of South Waziristan overnight, hours after killing 27 militants in the region in various strikes.
"We could see thick smoke and flames leaping into the sky from caves in the mountains after the bombing by jet fighters," said a resident near Shahoor who declined to be identified.
Security officials said they had no information about casualties in the latest attacks.
An army official in the region said some Taliban were trying to leave the area in disguise ahead of the offensive.
"They are now trying to run but we have tightened controls around their areas and are checking every person leaving," said the military official in Wana, the main town in South Waziristan, where the army has a base.
About 28,000 troops are in place to take on an estimated 10,000 hard-core Taliban, army officials have said.
Pakistan's stock market slipped as the violence escalated at the beginning of the week, but the main index was 1.1 percent higher at 0800 GMT.
Investors would be reassured by an offensive on South Waziristan as a sign the government was getting to grips with the militants, dealers say.
Pakistani Taliban fighters made advances towards Islamabad early this year, raising fears about the stability of the U.S. ally.
But significant military gains in the Swat Valley, from where militants have largely been driven out in recent months, have reassured the U.S. and Western allies about Pakistan's commitment to the fight.
In a sign of U.S. continuing support, President Barack Obama signed on October 14 a $7.5 billion aid bill for Pakistan over the next five years.
But Pakistan's military has complained about the bill because the legislation ties some funds to fighting militants and is seen by critics as violating sovereignty.