The incident took place in Mukherjee Nagar at around 11:15 am. Dikshit was on way to Burari to inaugurate Urs camp for pilgrims of Hazrat Khwaja Moinuddin Chishti Dargah in Ajmer when the incident took place.
"The Chief Minister's car was behind them. The personnel in the escort vehicles signalled the men in the car to give way but they did not. Later they had to be forcefully stopped," a senior police official said.
The official said they had to detain the youths, both in their mid-twenties, to ascertain their antecedents and motive.
"They were questioned by officials of Intelligence Bureau and Special Cell," the official said, adding experts from bomb disposal squad also checked the vehicle.
The official said it does not appear in preliminary interrogation that the youths deliberately did it and they had some motives.