Benazir Bhutto's political party said Wednesday that authorities were carrying out a massive crackdown on its supporters to stop them from taking part in next month's elections.
The government in Bhutto's home province of Sindh denied her party had been targeted, but said around 1,000 people had been arrested on charges stemming from rioting that broke out after her Dec. 27 assassination.
The violence left 60 people dead and caused tens of millions of dollars in damage.
"The common people suffered a lot of damage to their property and whoever is responsible for this will be dealt with in accordance with the law," said Akhtar Zamin, Sindh's interior minister. "We have nothing to do with anyone's party affiliation. We are objectively investigating to sort out the real culprits."
The claims by Bhutto's supporters are a sign of rising tensions ahead of the Feb. 18 parliamentary elections, which opposition parties claim President Pervez Musharraf is already intent on rigging. Musharraf denies the charge.
Latif Khosa, a senior senator from Bhutto's party, said police had filed charges against 400,000 of its supporters nationwide and arrested "thousands" of others.
"Administrative tyranny has been let lose on the people of Pakistan ... persecutory measures are being taken against our workers," said Khosa, alleging the arrests were to prevent Bhutto supporters "from taking part in the election process."
Sen. Lieberman visits
Visiting Sen. Joseph Lieberman, I-Conn., said Musharraf had assured him the parliamentary polls would take place as scheduled on Feb. 18, but acknowledged that opposition parties had little trust that the elections would be fair.
"I hope this distrust will be proven wrong," Lieberman told reporters. Unfair elections "will increase divisions, not the unity that the country needs," he said.
Lieberman met with Musharraf, military leaders and opposition politicians on his brief trip.
Musharraf blames Islamic militants for Bhutto's killing, which thrust Pakistan even deeper into political crisis at a time when it is battling fighters linked to al-Qaida and the Taliban movement.
But many opposition politicians and other government critics have alleged elements of his government were responsible, either directly or by failing to provide her with decent security.
A small team of officers from Britain's Scotland Yard is working with Pakistani police in the investigation.
Officers from the team have examined the car that Bhutto was traveling in when she was attacked, interviewed witnesses and scoured the crime scene, but have made no public statement.
On Wednesday, they traveled to the eastern city of Lahore where they intend to examine two pistols and some other crime scene material that is at a police forensic laboratory there, said Pakistani police forensic expert Amir Ali Hussain.