Heavy security prevented fresh protests in the Omani city of Sohar in April.
A group of Omani activists have condemned the government's crackdown and arrests of human rights activists in the Persian Gulf monarchy.
"We strongly condemn the repression and restrictions to the legitimate right of activists to express themselves peacefully," the group said in a statement on Tuesday.
The statement also described the "arrests targeting those who were calling for rational dialog" as disappointing, AFP reported.
Despite not mentioning the number of those arrested, the report stated that they were all detained after staging a sit-in on Thursday to demand the release of protesters held since demonstrations began in February.
Jaalan Bani Bu Ali, a spokesman from Oman's security services, told the state-run news agency ONA on Friday that the authorities have arrested a number of people for "inciting unrest and sedition" in the capital of Muscat and the southern city of Salalah.
The country was caught up in the protests sweeping the Arab world, with demonstrators taking to the streets on February 27 to call for better living conditions.
An unspecified number of detainees already face charges of setting fire to public and private properties, resisting the authorities, blocking traffic and humiliating or attacking state employees.
In March, Omani ruler Sultan Qaboos announced a cabinet reshuffle and the creation of 50,000 jobs to calm down the protesters, who have insisted that their rallies are aimed at "corrupt" officials and not at Qaboos.
