Singh, son of BJP President Rajnath Singh, was stopped at Amhat crossing in the district while he was on his way to Tanda, police said.
He was brought to Dhammaur police station and later sent back to Lucknow, police said.
Singh is general secretary of BJP's Uttar Pradesh unit.
Widespread clashes were witnessed in the handloom town of Tanda in Ambedkar Nagar district after Hindu Yuva Vahini district president was murdered on Sunday.
Meanwhile, party sources claimed that Singh was taken into custody and made to stay at the police station for three hours.
Later, Singh, while addressing workers alleged that state government was adopting double standards by lodging FIR against Raja Bhaiya on the complaint of slain police officer's wife but on the other hand turning a deaf ear to the complaint of murder of the Hindu Yuva Vahini leader.