Prime Minister Dr.Manmohan Singh today expressed India's concern over the slow progress of Mumbai trial in Pakistan. <br/><br/>Dr.Singh told his Pakistani counterpart Yusuf Raza Gilani that India is willing to discuss all issues of mutual concern through dialogue but the issue of terrorism is holding back the progress. The meeting took place on the sidelines of SAARC summit in Thimpu. <br/><br/>Briefing newsmen after the meeting Foreign Secretary Nirupama Rao said, Prime Minister Manmohan Singh and Pakistani Permier Yousuf Raza Gilani held very good talks in a free and frank manner. <br/><br/>The one-to one meeting lasted for over an hour. Later foreign ministers of the two countries also joined their leaders and Delegation level talks followed.