The suitcase was found just 50 metres away from the hall where the Ministers were waiting after arriving from Delhi, airport sources said.
It was removed to a safe spot and checked after the ministers left the airport, they added. The suitcase contained clothes.
The three ministers arrived here today to meet DMK chief M Karunanidhi, after the key UPA ally threatened to withdraw his ministers from the cabinet and quit the coalition if the Centre failed to move amendments to the US-backed resolution against Sri Lanka at United Nations Human Rights Council. (UNHRC).