( CNN ) -- A spate of fireworks debacles and tragic parade accidents wrecked Independence Day celebrations across the country . The mishaps Thursday left 20 people hospitalized in Southern California , two people dead in parades nationwide , two people seriously injured in Chicago and $ 1.5 million in damage in Seattle . Two people killed in parades . In Oklahoma , an 8-year-old boy on a parade float was killed when his father accidentally ran over him , Edmond police said . The boy was on a martial arts float that was driven by his father , police spokeswoman Jennifer Monroe said . It 's unclear whether the boy jumped or fell from the float before he was run over by the trailer 's tires . Another tragic parade accident took place in Bangor , Maine , when a man driving a tractor in the Independence Day parade died after a vintage fire truck struck him from behind , authorities said . Bangor police Sgt . Paul Edwards said the parade had been rerouted because of a four-hour standoff with a gunman who fired several rounds at police from an apartment window . The parade participants `` would not have been on that street normally , '' Edwards said . Fireworks shows gone awry . A display in Simi Valley , California , turned disastrous when fireworks exploded low to the ground and injured at least 26 people . Twenty-three of the 26 people who were treated at Simi Valley Hospital were released by Friday morning , said hospital CEO Kim Milstein . One person was transferred to a burn center and two people were admitted to the hospital and were in fair condition . Among those who were treated and released was a 17-month-old child . Injuries involved burns and shrapnel wounds , she said . Witness Annisa Wynn told CNN affiliate KTLA that fireworks suddenly began shooting sideways into the crowd instead of up into the air . `` The fireworks were so close , you could see them on the ground , '' Wynn said . `` It never happens this way . People were screaming . '' The show , carried out by a pyrotechnics company , was part of an annual series of fireworks displays that began in the city in 1970 , police Chief Mitch McCann said . Investigators were collecting evidence Friday , and the main investigation probably will begin Monday , Ventura County Deputy Fire Chief Mike LaPlant said . Another show in Windsor , Colorado , sparked flames that rose 10 feet high over parched land , witness Kami Gilmour said . `` The first embers dropped and looked like it might have started a small tree on fire , '' Gilmour said . `` Then we realized there were six or seven fires all along the field , and then a gust of wind came and blew the fire all over the place . ... Our car was about 50 yards from it and covered in soot . '' There was no immediate word of injuries from the Colorado fire . 6 die in Fourth of July Pennsylvania house fire . Fireworks sever woman 's foot in Chicago . An apparent near-ground fireworks explosion severed a woman 's foot and also seriously injured her sister-in-law in Chicago 's West Lawn Park on Thursday night , CNN affiliate WGN reported . The explosion severed the left foot of Kristina Perez , 32 , and left fourth-degree burns on the left leg of Lorena Perez , 34 , WGN said . `` One of the firecrackers , instead of going up , went to the ground and hit Kristina , '' her father , Eleuterio Carmona , told WGN . The women said they were watching a fireworks display at the park when the explosion happened . Both were in serious condition at a hospital Friday , WGN said . The display was not an official , regulated show , the station reported . Illegal fireworks destroy 14 boats . Seattle authorities said illegal fireworks sparked a massive fire that caused $ 1.5 million in damage . A firework landed on a boat cover at a boat storage facility on the north end of Lake Union , Seattle Fire Department spokesman Kyle Moore said . He said the dry storage facility stacks boats four stories high . Within seven minutes , the fire had destroyed 14 boats . Seattle also had three roof fires started by fireworks , according to Moore . As temperatures sizzle , fireworks even more risky . CNN 's Jake Carpenter , Dave Alsup , Dottie Evans and Mayra Cuevas contributed to this report .
Two women seriously injured in fireworks incident in Chicago , WGN reports . An 8-year-old Oklahoma boy and a man in Maine are killed while participating in parades . Comment: Illegal fireworks destroy 14 boats in Seattle and cause $ 1.5 million in damage .