A bomb that seriously injured two people in a Colorado town was left beside their car in a paper bag with their names written on it, police said Sunday.
Allyson Stone, 44, and her husband, 59-year-old Christopher Stone, were hospitalized with burns after the explosion on Saturday in Lafayette. No other information about the couple or the device had been released.
The couple found the bag as they were preparing to drive to Boulder, and they put it in the car with them, police said. Christopher Stone told investigators it exploded as his wife began to open it when they had driven about a block.
No one has been arrested.
About 20 homes were evacuated as police investigated. Residents were allowed to return about eight hours later when no other explosives were found. Police have said they believe the Stones were the target and that the public wasn't in danger.
Allyson Stone received death threats in 2010 after a dog bit her and the case went to court, The Denver Post reported. The dog could have been put to death under vicious-animal statutes but was spared. Authorities have said they don't believe the explosion was related to that incident but hadn't ruled it out.
The FBI and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives were assisting in the investigation.