"Received threat letter from LeJ. Will hold Punjab govt responsible 4 LeJ attacks if Sharif cont 2 give them protection & refuse2 take action," Bilawal, son of former Prime Minister Benazir Bhutto and Ex-President Asif Zardari, tweeted last night.
The PPP has in the past accused the Punjab government of sheltering the LeJ, which has also reportedly sent threat letters to the provincial government warning them to stop "atrocities" otherwise they would resort to targeting law enforcing agents and government officials.
A spokesman for Bilawal House, the official residence of the Zardari family, said steps have been taken to increase security for 25-year-old Bilawal and his sisters after the LeJ threats.
The PPP leader travels in a convoy of police and personal security vehicles in Karachi.
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Bilawal's mother was assassinated shortly after addressing a public rally in Rawalpindi in 2007 and before that she had survived a suicide bomb attack after returning to Pakistan from exile.
His remarks came against Bilawal's allegation that Punjab government is giving support to sectarian groups like the LeJ.
Bilawal has been raising his voice against all militant groups specially the Tehreek-i-Taliban Pakistan (TTP) ever since he declared war against them at start of his political career in December last year.
He assails the Taliban and their sympathizers for trying to drag the country back to the "stone-age", Dawn reported.
Resolutions condemning the threatening letter received by chairman Bilawal and demanding action against those responsible were moved in the National and Sindh assemblies.