CBI today summoned the former Telecom minister Arun Shourie in 2G spectrum allocation issue. According to agency sources he will be questioned in CBI Headquarters’ in New Delhi next week. Earlier Mr Shourie claimed that he had informed the Prime Minister's Office and top BJP leaders about the reported scam in the spectrum allocation. The Investigating agency is probing the issue and is questioning former Telecom Minister A Raja. Several Top functionaries working in the Department of Telecom and Raja's personal staff have also been arrested.