**At least six people have died in a bomb blast in the north-western Pakistani city of Peshawar, police officials say.**The explosion is reported to have taken place at a police investigation bureau in the Swati Pathak area, which is close to the Pakistani army garrison.
Security has been tightened across Pakistan after a series of attacks in Lahore and the north-west on Thursday .
About 40 people died in those attacks, the latest in a recent wave of brazen militant assaults across the country.
Friday’s attack is thought have been caused by a suicide car bomb.
Strategic city
Peshawar was also targeted a day earlier, when a bombing killed a child - and one week ago, when a deadly bomb ripped through a busy city market in the city
That attack killed at least 49 people in the busy Khyber Bazaar.
Peshawar, the capital of Pakistan’s North West Frontier Province, has seen regular bomb and gun attacks in recent years.
The city occupies a strategic position on the road to the Afghan border and is the gateway to Pakistan’s tribal regions, long regarded as a haven for Islamist militants.
The latest wave of attacks comes as Pakistan’s military prepares for what the government has said is an imminent assault on the Taliban stronghold in South Waziristan.
Nuclear-armed Pakistan is under US pressure to flush out militants as President Barack Obama considers sending more troops to neighbouring Afghanistan.
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