With the Delhi Police intensifying its probe into a farmers' protest toolkit shared by Swedish climate activist Greta Thunberg earlier this month, the role of farmer leaders may also be probed, sources have said. The Delhi Police have also written to video communications app Zoom, say sources, to seek details of the attendees at a virtual meeting on January 11, which was also attended by activists Disha Ravi, Nikita Jacob, Shantanu.