War veteran and survivalist searched for info on moving to Canada before killing daughters, investigators say | National & World [Video]

(CNN) — Google searches and blood evidence are the latest tools being used in the manhunt for a former active duty soldier accused of murdering his own children, with authorities in Washington state advising residents to “secure your homes and vehicles.”

The US Marshals Service is helping search for Travis Decker, 32, who hasn’t been seen since May 30. His three daughters – all under age 10 – were found June 2, suffocated at an isolated, abandoned campsite east of Seattle.

Since then, an intense manhunt over hundreds of square miles has unfolded, the Chelan County Sheriff’s Office says.

The father is charged with the aggravated murder and kidnapping of the Decker sisters: Olivia, 5, Evelyn, 8, and Paityn, 9. With federal agents now involved in the search for him, Decker also faces a federal charge of Unlawful Flight to Avoid Prosecution. A reward of up to $20,000 is offered for information leading to his arrest.

Decker’s truck, his dog and “many …