Agra, Jan 17 (ANI): Security has been tightened in and around Taj Mahal in Agra ahead of US President Barack Obama's visit. The US president will arrive in New Delhi on January 25 and hold discussions with Prime Minister Narendra Modi, who visited Washington in September. An official agenda has not been released. According to media reports, Obama is likely to visit Taj Mahal. Senior police officials said they were taking no chances with security after an alert from US intelligence that militants operating from Pakistan could target the Agra-Delhi Yamuna expressway. The 17th century monument was built by Mughal emperor Shah Jahan as a mausoleum for his wife Mumtaz Mahal.