havana fireworks explosion injure 39 people include six children age 11 15 popular cuban carnival christmas eve state-run media report monday centuries-old parrandas festival central town remedios take place every dec. 24 draw thousands cubans tourists unfortunate accident fireworks occur last night remedios government cubadebate internet news service report among 20 seriously injure accord cubadebate health authorities say grave less grave others critical critical condition injure appear local residents report mention tourists hurt remedios locate villa clara province northern coast island two town neighborhoods compete christmas eve year put spectacular show float fireworks amidst carnival atmosphere cause explosion investigation accord official media 39 injure fireworks explosion cuban festival christmas eve