The United Arab Emirates' state news agency says the son of a jailed activist has himself been sentenced to prison after being convicted over messages sent on social media and of joining an illegal group.

The verdict Tuesday against Osama al-Najjar follows a crackdown by Emirati authorities on suspected Islamist sympathizers in the wake of the Arab Spring.

His father, Hussain al-Najjar, was one of 69 dissidents convicted last year, many of them members of al-Islah, an Islamist group since branded a terrorist organization by the Emirates.

The statement by state news agency WAM did not mention al-Najjar by name, though other media did or identified him by his initials. He was sentenced to three years in prison and fined the equivalent of about $136,000.