Article title is assuming it was actually struck. According to same article, radio from the aircraft to ATC said "We just heard a bang on the plane, so we'll have to look at it when we get to the gate. We're just hoping it was just a mortar that went off underneath, but definitely felt a big bang."
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Link to the liveatc.net recording: https://forums.liveatc.net/index.php?action=dlattach%3Btopic%3D18860.0%3Battach%3D14100
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