A letter written to Pakistan by Switzerland Tuesday revealed that the corruption cases cannot be reopened against President Asif Ali Zardari in any Swiss court of law, a media report said.

Pakistan's law ministry, which received the Swiss government’s response to the letter written to it by the government of Pakistan following the apex court’s order in the NRO case, opened the sealed envelope Tuesday.

The report quoted sources as saying that the Swiss authorities made it clear the graft cases against President Asif Ali Zardari and others could not be reopened as they have died down forever being 'time-barred'.  The letter was opened by the Minister for Law, Zahid Hamid, said sources.

Earlier, the sources said that recently the Pakistan mission in Switzerland was approached by the caretaker government to get the host government’s response over the letter written to the Swiss authorities by the Pakistan Peoples Party (PPP) government with regard to the withdrawal of the 2008 Attorney General’s letter for the withdrawal of cases.

The sources added that the Pakistani mission approached the Swiss government and got its response, which has now arrived in the law ministry.

The PPP law minister Farooq H Naek had claimed that the Swiss authorities had dropped the cases according to their own laws, and not in accordance with immunity under the Pakistani laws.