Former Sri Lankan President Mahinda Rajapaksa's son was arrested today along with four other people over money laundering allegations.

Yoshitha Rajapaksa, the second son of ex-strongman Mahinda was, arrested and quizzed this morning by the police's Financial Crimes Division at the Sri Lankan Navy headquarters, a navy spokesman said.

He and four others have been arrested on money laundering allegations, police said in a statement.

Yoshitha, who is a navy officer, is the first immediate family member of former President Mahinda to be arrested since his shock defeat at the hands of Maithripala Sirisena in the polls last year.

He was quizzed in connection with TV channel Carlton Sports Network which had close links with the Rajapaksa sons. CSN was controversially handed over Sri Lankan cricket's television broadcast rights under the Rajapaksa regime.

The broadcast rights had been the preserve of the state television until then. Nishantha Ranatunga, who was CSN's chief executive officer, was also among those arrested. He was also the secretary of the cricket governing body.