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The bombing of Pan Am Flight 103 killed 270 people, including 190 Americans, and launched a decades-long international manhunt for the attackers.
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Ukraine's electrical grid has been under assault from Russian airstrikes for two months. Repair workers are racing to fix damaged power stations, even as the country braces for more attacks.
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Federal officials are examining whether the employee who reported an explosion at Northeastern University may have lied to investigators and staged the incident, law enforcement officials said.
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Suicide bombings have been rare in the Iraqi capital since the country's military largely defeated the Islamic State group in 2017. But ISIS has reportedly claimed responsibility for the attacks.