Uttar Pradesh will observe three days of state mourning for the death of Samajwadi party veteran Mulayam Singh Yadav, Chief Minister Yogi Adityanath has announced. The BJP leader also spoke to Mulayam Singh's son Akhilesh Yadav, who is Leader of Opposition in the assembly, and brother Ram Gopal Yadav over the phone to convey his condolences, said a spokesperson.