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By Niluksi Koswanage and Nguyen Phuong Linh KUALA LUMPUR/PHU QUOC ISLAND, Vietnam (Reuters) - Search and rescue planes scoured waters off the southern tip of Vietnam on Monday, searching for any trace of a Malaysia Airlines jetliner 48 hours after it vanished from radar screens with 239 people on board. Questions mounted over possible security lapses and whether a bomb or hijacking could have brought down the Beijing-bound plane, after Interpol confirmed at least two passengers used stolen passports and said it was checking whether others aboard had used false identity documents. Flight MH370 disappeared in the early hours of Saturday, about an hour into its flight from Kuala Lumpur, after climbing to a cruising altitude of 35,000 ft. The Civil Aviation Authority of Vietnam said on its website late on Sunday that a Vietnamese navy plane had spotted an object in the sea suspected of being part of the Boeing 777-200ER, but that it was too dark to be certain. "We are sending more planes there this morning." Shares in Malaysia Airlines fell as much as 18 percent to a record low on Monday morning.
The Taliban on Monday vowed to target Afghanistan's presidential election, urging their fighters to attack polling staff, voters and security forces before the April 5 vote to choose a successor to Hamid Karzai. Previous Afghan elections have been badly marred by violence, with at least 31 civilians and 26 soldiers and police killed on polling day alone in 2009 as the Islamist militants displayed their opposition to the US-backed polls. NATO combat troops will withdraw from the country by the end of 2014 after 13 years of fighting a fierce Islamist insurgency that erupted when the Taliban were ousted from power after the 9/11 attacks on the United States. "We have given orders to all our mujahideen to use all force at their disposal to disrupt these upcoming sham elections -- to target all workers, activists, callers, security apparatus and offices," the Taliban said in an emailed statement.