Maharashtra minister Aaditya Thackeray was stopped by Prime Minister Narendra Modi's security today when he went with his father, Chief Minister Uddhav Thackeray, to receive him. Sources close to the Environment minister, who also handles the government protocol portfolio, said his identity had to be explained to the Special Protection Group before he was allowed entry to the INS Shikra, the naval heliport in Mumbai's Colaba.