* Yingluck staying outside capital
* Army chief rules out coup to end standoff
* Caretaker government in limbo as crisis shows no sign of ending (Adds comment from army chief)
By Amy Sawitta Lefevre
BANGKOK, Feb 24 (Reuters) - Thai Prime Minister Yingluck Shinawatra, the target of anti-government protesters who have blocked parts of Bangkok for weeks, has left the city and is staying 150 km (90 miles) away, her office said on Monday, without specifying the location.
The protests, punctuated by occasional gunfire and bomb blasts, including one on Sunday that killed a woman and a young brother and sister, are aimed at unseating Yingluck and erasing the influence of her brother, former premier Thaksin Shinawatra who is seen by many as the power behind the government.
Yingluck's office told reporters she was not in Bangkok and asked media to follow a convoy outside the city to where they said Yingluck was "undertaking official duties".
The office would not confirm how many days Yingluck had been working outside the capital. She was last seen in public in Bangkok nearly a week ago, last Tuesday, and is due to attend a corruption hearing there on Thursday.
Foreign Minister Surapong Tovichakchaikul said Yingluck would hold a cabinet meeting on Tuesday.
"It is highly likely that we will hold the cabinet meeting outside of Bangkok. As for the prime minister's exact whereabouts today, I have not been informed," Surapong told reporters.
The political crisis, which pits the mainly middle-class anti-government demonstrators from Bangkok and the south against supporters of Yingluck from the populous rural north and northeast, shows no sign of ending soon.
But the army, which toppled Thaksin in 2006 in the latest of 18 coups or attempted coups since Thailand became a constitutional monarchy in 1932, said it would not intervene this time round.
"Somebody has to take responsibility but that doesn't mean soldiers can intervene without working under the framework (of the law)," army chief Prayuth Chan-ocha said in a rare televised address.
"How can we be sure that if we use soldiers, the situation will return to peace?"
Protesters, who disrupted and boycotted this month's general election, have been urged by their leader to target businesses linked to Thaksin and gathered outside a television station on Monday managed by Thaksin's son.
They also headed for the foreign and finance ministries.
The Election Commission had said it would try to complete the election process in late April, but has since suspended that date pending a court decision, leaving the country in limbo under a caretaker government with limited powers.
BROTHER AND SISTER KILLED
It was not immediately clear who was responsible for Sunday's bomb blast in a busy central shopping district, but the polarisation of Thai society raises the possibility of wider civil strife.
The six-year-old sister of a boy killed in the attack died on Monday, doctors said, taking the death toll to three.
Each side has accused the other of instigating violence, while armed provocateurs have a history of trying to stir tension. Protesters and the police have blamed violence on shadowy third parties.
Yingluck described Sunday's attack, and one on Saturday in the eastern province of Trat in which a five-year-old girl was killed, as terrorism.
"I strongly condemn the use of violence in recent days ... since the lives of children were lost," she said on Facebook.
"The violent incidents are terrorist acts for political gains without regard for human life."
The United Nations Children's Fund (UNICEF) urged parents to keep children away from protest sites.
At least 20 people have been killed and hundreds wounded since the protests began in November, according to the Erawan Medical Center, which monitors hospitals.
They are the biggest since deadly political unrest in 2010, when Thaksin's "red shirt" supporters paralysed Bangkok in an attempt to remove a government led by the Democrat Party, now the main opposition party.
More than 90 people were killed and 2,000 wounded during that unrest, which ended when troops moved in.
Demonstrators accuse Thaksin of nepotism and corruption and say that, prior to being ousted in 2006, he used taxpayers' money for populist subsidies and easy loans that bought him the loyalty of millions.
Rice farmers, angry at not being paid under a government rice subsidy scheme, called off a protest tractor drive to Bangkok's main airport on Friday after an assurance they would get their money this week. (Additional reporting by Aukkarapon Niyomyat, Pairat Temphairojana and Panarat Thepgumpanat; Writing by Nick Macfie; Editing by Alan Raybould and Robert Birsel)