"We are examining the 30-minute video speech of Azam Khan on Kargil War and other issues. We have stared probe and if he is found guilty, strict action would be taken against him," said a senior poll official, who didn't wish to be named.
Khan had kicked up a controversy earlier this week by saying it was "Muslim soldiers" who fought for India's victory in the 1999 Kargil war against Pakistan.
In a speech laced with communal tones, Khan had said during a party rally on Monday, "Those who fought for victory in Kargil were not Hindu soldiers, in fact the ones who fought for our victory were Muslim soldiers."
The controversy-prone Khan, a minister in the Uttar Pradesh government, had also called Narendra Modi's close aide Amit Shah "Gunda no 1", saying he has come to Uttar Pradesh to "create terror".