In this July 31, 2015 file photo, a Jordanian protester carries the national flag during a rally by the Muslim Brotherhood, in Amman, Jordan. The Jordan branch recently severed ties with the region-wide movement based in Egypt.

Police in Jordan sealed the headquarters of the Muslim Brotherhood in Amman on Wednesday, a senior figure in the Islamist movement said, as the authorities clamp down further on the kingdom’s most vocal opposition group.

The Brotherhood, which is close in ideology to its Egyptian namesake and has strong ties with the Palestinian movement Hamas, wants sweeping political reforms but stops short of calling for the overthrow of the monarchy.

Jordan’s authorities suppressed Arab Spring pro-democracy protests, and human rights groups say that since then the kingdom has strongly curbed dissent.

Police acting on orders of the Amman governor evacuated staff and closed off the building, giving no reason for their actions, said the Brotherhood senior member, Jamil Abu Bakr.

Government spokespeople and police were not immediately available for comment.

The Brotherhood has operated legally in Jordan for decades and has substantial grass-roots support in major urban centers.

Its political arm, the Islamic Action Front, is the kingdom’s largest opposition party and represents many disenfranchised Jordanians of Palestinian origin, who are in the majority in the population of seven million.

Grossly underrepresented in parliament and government posts that are dominated by native Jordanians, many of the Brotherhood’s poor Palestinian supporters in the major cities see them as defending their interests.

“We are not a group that is rebellious or operating outside the law. This is not an appropriate means to deal with us… deploying heavy-handed security measures against us rather than reaching understandings,” Abu Bakr told Reuters.

In keeping with a regional crackdown on political Islam and public freedoms, Jordan has been tightening restrictions on the Brotherhood in the last two years, forbidding their public rallies and arresting vocal government dissenters.

The authorities have also encouraged a splinter group to legally challenge the main movement’s license to operate, which goes back to 1946 when Jordan’s monarchy had in Muslim Brotherhood leaders a strong political allies.

Earlier this year, the movement’s deputy leader Zaki Bani Rusheid was released after serving an 18-month jail sentence for criticizing on social media the United Arab Emirates for its crackdown on Islamists.

His detention was the first of a major political opposition figure in Jordan in recent years.

In contrast, Gulf Arab countries have banned Islamist groups and jailed its members, and in Egypt thousands of Islamists have been jailed and sentenced to death in mass trials decried by human rights groups.

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