Since Chinese authorities arrested two airline passengers for allegedly plotting to blow up a domestic flight, some analysts and activists are casting doubt on the state's claim that it had thwarted a pre-Olympics terrorist plot.

The passengers were reportedly arrested after flammable material was found in the airplane's toilet last Friday. The flight originated in western China, a region where pro-independence Uighur rebels are believed to operate, and was bound for Beijing, the host city for this summer's Olympics.

Few details have emerged of the incident, or about why the plane was allowed to continue to Beijing after an emergency landing in the western city of Lanzhou. Questions have also been raised over separate claims that militants in the little-known East Turkmenistan Islamic Movement, a UN-designated terrorist group, are plotting to disrupt the Olympics. Exiled Uighur activists condemned the reports as "falsified" terror plots designed to discredit their cause.

Airport security has been tightened at Urumqi in Xinjiang, the origin of the China Southern Airlines flight, reports the Associated Press. Chinese media, citing security sources, have reported that a young Uighur woman was among those detained. The head of civil aviation said the crew acted after passengers were found with a "suspicious liquid."

The BBC reports that Xinjiang's governor accused the suspects of "an attempt to crash the plane" and said the crew's response had averted "an air disaster."

"Who the people involved in the incident were, where they were from, what their aim was and what their background was, we are now investigating," he said.

On Monday, a US-based Uighur activist accused Beijing of fabricating terror plots to justify further repression of Uighur communities, reports Al Jazeera. The head of the Uighur American Association, Rebiya Kadeer, said the latest incident was a cover for a political crackdown in Xinjiang. Ms. Kadeer asked why the detained suspects from the aircraft weren't paraded before the cameras.

"It seems that the Chinese government has one goal, which is to create this scenario of terrorism, and produce a terrorist action itself so that it can blame the Uighur people," [Kadeer] said.

The oil-rich region of Western China has around 8 million Uighurs, Muslims with ethnic, linguistic, and cultural ties to central Asia. Many resent the Han Chinese majority and restrictions on religious and cultural expressions. Sporadic antigovernment violence flared in the 1990s, but few incidents have been reported in recent years.

News of the alleged attack emerged during China's annual legislative meeting in Beijing. In addition to the apparent aircraft attack, Wang Lequan, a Communist Party leader, saidpolice had shot dead two members of a "terrorist gang" and arrested 15 others during a raid in January in Xinjiang, Reuters reports. He said the gang was been plotting to "damage the Beijing Olympics." In January 2007, Chinese forces killed 18 alleged terrorists in Xinjiang, during what authorities said was a raid on a training camp in the mountains.

So far, Chinese media downplayed the story, the Daily Telegraph in London reported. No mention of the terror plot was carried Monday in the People's Daily, the official party mouthpiece, or by the Chinese-language service of Xinhua, the state-run news agency. Xinhua's English-language report, issued Sunday after Mr. Wang and Mr. Bekri revealed the threats, was later removed from its website.

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