TEHRAN (Press Shia Agency) – A so-called anti-corruption probe that has purged Saudi Arabian royals, ministers and businessmen appeared to be widening on Monday after the founder of one of the kingdom’s biggest travel companies was reportedly detained.

Shares in Al Tayyar Travel plunged 10 percent in the opening minutes of trade after the company quoted media reports as saying Nasser bin Aqeel al-Tayyar, who is still a board member, had been held by authorities, Reuters reported.

The company gave no details but Saudi media outlets said Tayyar had been detained in an investigation by a new anti-corruption body headed by Crown Prince Mohammed bin Salman.

Dozens of people have been detained in the crackdown, which has consolidated Prince Mohammed’s power while alarming much of the traditional business establishment. Billionaire Prince Alwaleed bin Talal, Saudi Arabia’s best-known international investor, is also being held, officials said at the weekend.

The front page of Okaz, a leading Saudi newspaper, challenged businessmen on Monday to reveal the sources of their assets, asking, “Where did you get this?” in a bright red headline.

Pan-Arab newspaper Al-Asharq Al-Awsat reported that a no-fly list had been drawn up and security forces in some Saudi airports were barring owners of private jets from taking off without a permit.

Among those detained are 11 princes, four ministers and tens of former ministers, according to Saudi officials.

The allegations against the men include money laundering, bribery, extorting officials and taking advantage of public office for personal gain, a Saudi official said. Those accusations could not be independently verified and family members of those detained could not be reached.

A royal decree on Saturday said the crackdown was in response to “exploitation by some of the weak souls who have put their own interests above the public interest, in order to, illicitly, accrue money”.

Analysts said the arrests were also a pre-emptive measure by the crown prince to remove powerful figures as he reportedly seeks to reshape the economy and society of the world’s leading oil exporter.

Over the past year, Prince Mohammed has become the ultimate decision-maker for the kingdom’s military, foreign, economic and social policies, causing resentment among parts of the Al Saud dynasty frustrated by his meteoric rise.

The round-up also targeted Prince Miteb bin Abdullah, who was detained and replaced as minister of the powerful National Guard, recalling a palace coup in June which ousted his elder cousin, Mohammed bin Nayef, as heir to the throne and interior minister.

All these moves have cemented the young crown prince’s position in power.