Pakistan People's Party (PPP) chairperson Bilawal Bhutto Zardari on Friday took to Twitter to silence rumours about a possible meeting between former president Asif Ali Zardari and Prime Minister Nawaz Sharif in London. "AZ is not meeting NS," Bilawal tweeted using initials to refer to the two politicians. Both the premier and PPP co-chairman Asif Ali Zardari are in London currently.