Union Minister Kiren Rijiju on Monday sought an apology from Congress president Mallikarjun Kharge and Leader of Opposition in Lok Sabha Rahul Gandhi for their party workers` alleged threat to Prime Minister Narendra Modi`s life.

At a hurriedly called press conference here, Rijiju alleged that at Sunday`s Congress rally in the national capital, some party workers had threatened to dig the grave of the Prime Minister, which was the "most unfortunate and tragic" thing to happen in Indian democracy.