New Delhi, (Agencies): Former telecom minister A Raja’s brother was grilled by the CBI in connection to with the 2G spectrum scam.

According to official sources Raja's brother A K Perumal came to the CBI headquarters in the morning and his questioning took place till late in the evening.

Though officials were tight-lipped about the line of questioning, sources said, he was questioned on certain financial transactions and his dealings with certain firms.

Sources said another associate of Raja was also questioned on Tuesday in the same case.