U.S. missiles killed six suspected militants in northwestern Pakistan
 near the Afghan border Saturday, Pakistani intelligence officials said.
 The strikes were part of a flurry of such attacks which could indicate a
 more aggressive American strategy against insurgents finding sanctuary 
there.
The United States is pressing Pakistan for action against 
Afghan insurgents in the region, especially the Haqqani network that it 
says is the No. 1 threat in Afghanistan and receives assistance from the
 Pakistan army.
Independently of what Pakistan does, Washington 
may up the tempo of missile strikes or widen their targeting, although 
either option could strain its already complicated relationship with 
Islamabad.
Washington has regularly used drones since 2008 to 
pummel insurgents and their hideouts in Pakistani tribal regions. U.S. 
officials do not acknowledge the CIA-led program. Pakistan publicly 
protests the strikes, which are unpopular in this Islamic nation, but 
tolerates them in practice.
In the latest attack, drone-fired 
missiles slammed into a compound near the border town of Angore Adda in 
the South Waziristan tribal region. The strike targeted fighters of 
Maulvi Nazir, a Pakistani militant commander who is accused of working 
with the Taliban and al-Qaida to direct cross-border attacks, the 
officials said, speaking on condition of anonymity as they were not 
authorized to talk to media on record.
Saturday's strike was the latest in a string of missile attacks targeting the militant-infested border region.
On
 Friday, U.S. missiles killed four unidentified people in a part of the 
North Waziristan tribal region where the Haqqani network holds sway. A 
day earlier, a strike in North Waziristan killed Janbaz Zadran, who U.S.
 officials say was a top commander in the Haqqani network and had helped
 orchestrate attacks in Kabul and southeastern Afghanistan.
The three attacks broke a relative lull in recent weeks, though that kind of tempo is not unusual.
So
 far this year, there have been more than 50 strikes, most of them North
 Waziristan region, where the Haqqanis are based. U.S. officials say the
 missiles are killing militants and their supporters; human rights 
groups have questioned that, saying civilian deaths are common.
Meanwhile,
 Pakistani police said Saturday they had arrested a Russian and two 
nationals from Azerbaijan in Lakki Marwat, a town located near North 
Waziristan. It was not clear how the men reached the region, which is 
off limits to foreigners, and authorities said they were still 
investigating to determine whether the men had any links to militant 
groups. AP
