Prasad had come to the airport to receive another person arriving from Dubai. The duo was apprehended when the latter attempted to hand over the gold to the MP's aide.
The agency reported citing sources that Prasad had the permit to enter the aerodrome, which allowed him entry into the airport. He allegedly entered the airport premises and received the packet. They allegedly recovered 500 grams of gold from them.
Meanwhile, union minister Rajeev Chandrasekhar took a sharp jibe at the Congress, CPM's partnership at the national level, calling them an alliance of "gold smugglers".
"First CM Secy involved in Gold smuggling, now Cong MP "aide"/PA detained for Gold smuggling. CPM and Cong - both INDI alliance partners - alliance of gold smugglers," BJP leader Chandrasekhar wrote on X.
In 2020, Kerala was hit by a gold scam after the seizure of 30 kg of gold at the Thiruvananthapuram airport from a diplomatic bag.
M Sivasankar, the then principal secretary to Kerala CM Pinarayi Vijayan, was suspended and removed from his over the allegation that he had links with one of the accused.
Chandrasekhar is the Bharatiya Janata Party's candidate from Thiruvananthapuram, which is Tharoor's parliamentary constituency.
Tharoor has contested the ongoing Lok Sabha elections from the Kerala seat.