A human rights group says Belarus has launched criminal probes against at least 18 leading opposition figures over their alleged involvement in post-election riots.

The organization Vesna said Wednesday that those accused -- including seven of the nine candidates who ran against the country's authoritarian leader -- face up to 15 years in prison if convicted.

Rights Group: Some Belarusian Opposition Candidates May Face Jail Terms

Overall, Belarusian authorities jailed more than 600 people in the wake of Sunday's protests against the re-election of President Alexander Lukashenko.

Rights Group: Some Belarusian Opposition Candidates May Face Jail Terms

In the election, Mr. Lukashenko won a fourth consecutive term, capturing 80 percent of the vote. No other candidate won more than three percent.

Rights Group: Some Belarusian Opposition Candidates May Face Jail Terms

More than 30,000 demonstrators took to the streets after polls closed to protest what they said was a fraudulent election. European observers and U.S. officials also have strongly criticized the election process.