Patna: Two Thai nationals were arrested at Patna airport with old currency notes of Rs 1,000 and Rs 500 denominations worth Rs 1.5 crore 0n late Thursday evening by CISF personnel. Both the arrested youths had landed here by flight from Lucknow. Sources said the two were on way to Bodh Gaya and the money was donation. Patna airport authorities have informed their officials about the recovery of huge cash. CISF officials were quizzing the youths. Patna SSP Manu Maharaaj said that the arrest was made by CISF men at airport. IT officials too are looking into the matter.