The Delhi police has summoned AAP leaders Sanjay Singh, Kumar Vishwas and Ashish Khetan, AAP MP from Punjab Bhagwant Mann and Neeraj Pandey, for questioning on Thursday in the suicide case of 41-year-old Rajasthan farmer Gajendra Singh. During probe, sources said, police found that AAP leaders had allegedly motivated Gajendra Singh, father of three kids, to hang himself during an AAP rally against land acquisition in the presence of Delhi Chief Minister Arvind Kejriwal on April 22, last year.