The report, issued by a scrutiny committee of the ECP, indicated that PTI provided "false information" about their funding to the constitutional body.
A bank statement from the State Bank of Pakistan showed that the party received Rs1.64 billion in funding, of which more than Rs310 million remained unreported and unaccounted for, according to the report.
A chorus of members from various opposition parties, including the Pakistan Muslim League-N (PML-N), Pakistan Peoples Party (PPP) and Pakistan Democratic Movement (PDM), condemned the ruling party's concealment of funds and called for immediate further investigation.
In a statement, PML-N Vice President Maryam Nawaz said that Imran Khan, "not only stole and hid but also plundered the pockets of the people and indulged in their hard work and hard earned money."
https://twitter.com/MaryamNSharif/status/1478373690907807752
PPP’s Central Information Secretary Shazia Marri echoed the sentiment, calling for the prime minister to give himself up for investigation.
https://twitter.com/ShaziaAttaMarri/status/1478374860070006785
At a press conference in Lahore, the PPP information secretary demanded that PTI and PM Imran Khan provide the ECP with complete details of their bank accounts and funding sources.
"You have given details about 12 accounts, where are the details of the rest of the accounts?" she inquired.
PDM spokesperson Hafiz Hamdullah released a statement reiterating that the ECP's findings, "revealed the theft of Imran Khan and PTI".
"The scrutiny committee has exposed the true face of the PTI before the nation [...] Imran Khan and PTI, who accused others of theft, turned out to be thieves themselves," Hamdullah said.
The ongoing foreign funding case against PTI was filed in 2014 by the party's founding member Akbar Babar.
In the original filing, Babar alleged significant financial irregularities, including illegal sources of funding, hidden bank accounts in Pakistan and abroad, money laundering, and the use of private bank accounts to receive illicit funds from the Middle East.