Prime Minister Narendra Modi arrived here on Saturday to attend the centenary celebrations of the Patna University.Modi was received by Bihar Governor Satyapal Malik, Chief Minister Nitish Kumar and several Bharatiya Janata Party leaders.Unprecedented security arrangements were in place for Modi's visit. Patna has been turned into a fortress with thousands of security personnel deployed and traffic diversions made.After attending the centenary celebrations of the Patna University, Modi will lay the foundation stones for several projects here.Four sewerage projects under the Namami Gange Programme and four national highway projects in Mokama area of Patna district.The total outlay of these projects will be over Rs 3,700 crore.