New Delhi: Against the backdrop of BJP MLA Sangeet Som's visit and controversial speech in Dadri, Delhi Chief Minster Arvind Kejriwal today alleged "collusion" between ruling Samajwadi Party in UP and the BJP and questioned Prime Minister Narendra Modi's "silence" over it.

"Collusion between parties in the state and Centre? What is happening is quite dangerous. PM's silence almost a tacit approval," Kejriwal tweeted referring to controversial BJP MLA Sangeet Som's visit to Dadri where he attacked Samajwadi Party (SP) government.