Hyderabad: Prime Minister Narendra Modi Saturday took part in an hour-long Yoga session with top police officers of the country, who gathered here at the Sardar Vallabhbhai Patel National Police Academy for an annual conference focusing on cross-border terrorism, infiltration and radicalisation of youth. Later, he paid tributes to Martyrs Column at SVPNPA here, where he placed a wreath. The Prime Minister also paid floral tributes to Patel at his statue at SVPNPA, and planted a sapling on the Academy premises. The three-day conference of the Directors General of Police (DGPs) of all states was inaugurated here on Friday by Home Minister Rajnath Singh. Union Ministers of State for Home Affairs Kiren Rijiju and Hansraj Gangaram Ahir, besides National Security Adviser (NSA) Ajit Doval and Home Secretary Rajiv Mehrishi are among those attending the event.