By Mick Krever, CNN
Thailand is investigating the two stolen passports held by passengers on missing Malaysia Airlines Flight 370, Thai Prime Minister Yingluck Shinawatra told CNN’s Christiane Amanpour in an exclusive interview on Monday.
“We don't know about their nationality yet,” Yingluck told Amanpour, pledging “full support” with international investigators. “We gave orders for the police to investigate the passport users.”
“At the same time, our Royal Air Force has been assigned, together with the Navy, to search for the disappeared airplane in conjunction with the Malaysian government.”
Search and rescue officials said Monday they will expand the search area for the Malaysia Airlines aircraft that vanished three days ago.
“At the moment,” Prime Minister Yingluck said, “we have not yet discovered anything.”
The Malaysian government has divided up the ocean in order to aid the search, she told Amanpour.
While Thailand remains at the heart of the search for the downed plane, Yingluck herself has been at the heart of months of protests.
Her government was largely stable until her party attempted to pass a controversial amnesty bill in November, sparking the current wave of protests. The bill would have nullified a corruption conviction against her brother, former Prime Minister Thaksin Shinawatra.
“We will not return the amnesty legislation again,” she said, but added that the opposition has continued their protests nonetheless.
“Their demands are unconstitutional and undemocratic, which my government cannot accept.”
The People's Democratic Reform Committee has called for the democratically elected Yingluck to be replaced with an unelected "people’s council," which would see through electoral and political changes.
Yingluck’s brother was ousted in a military coup in 2006, and is currently living in self-imposed exile in Dubai.
Many of Prime Minister Yingluck’s opponent accuse her of being a puppet, with her brother pulling the strings of government from abroad.
“May I say that I am…a Prime Minister, who [has been] able to run the country for over two years,” she said. “But I understand their feeling, as I was born from that country so I have used my ability to win the peoples’ trust.”
“If I had to rely on other people or my brother, I believe I wouldn’t have solved the problems,” she told Amanpour, such as massive floods the country faced in 2011.
Yingluck’s government seems to have survived the protests so far, but she still face an ongoing legal challenge over a rice subsidy scheme.
The country’s National Anti-Corruption Commission has said it will bring charges against Yingluck over the program, which pledged to pay farmers well above the market rate for their rice but has run into financial problems.
Yingluck told Amanpour that her government fully briefed the Thai people and parliament on the program.
“There has been no investigation of me yet,” she said. “There is an appropriate procedure to give evidence to the commission, then they can decide the facts.”
Amanpour asked Yingluck if she feared a military coup against her government, especially give the action taken against her brother.
“I believe it is a sufficient lesson for us to realize that the coups are not the way to solve the problems of Thailand,” she said. “I believe that if we keep peace and avoid serious incidents, the military coups cannot take place in Thailand.”
“Today our world has changed. Many countries can see that any rebellious actions are not the solution. And other countries will not let Thailand enter into the coups mode.”
CNN’s Kocha Olarn and Ashley Fantz contributed to this report.