THE murder of three Washington sisters has spurred a push for new laws after outraged citizens insisted the tragedy was preventable.

A petition demanding changes to the Amber Alert system is gaining traction as the manhunt persists for fugitive Travis Decker.

Decker, 32, faces allegations of murdering his three young daughters and abandoning their bodies at a campsite in Washington state after a presumed three-hour custody visit on May 30.

Despite their mother, Whitney Decker, reporting them missing when Decker failed to return them to Wenatchee, 150 miles east of Seattle, an Amber Alert was not activated.

Authorities stated the situation did not fulfill the Amber Alert criteria, as Decker had legal custody of his daughters and had no record of violence towards them.

Instead, cops issued a lesser notice called an Endangered Missing Persons Advisory.

Had an Amber Alert been issued, a notification would have been sent to millions of cellphone users across the state, urging them to be on the lookout for the missing children.

Now, an online petition addressed to the Washington State police is asking for changes to the alert requirements.

“As it stands, the AMBER Alert criteria do not adequately cover many high-risk cases, particularly those involving parental abductions with past abuse or warning signs,” states the petition.

“Should the criteria remain unaltered, we run the risk of more children slipping through the cracks—children who could be rescued if their situations were handled with the necessary urgency.”

“We must not let another parent feel Whitney’s unimaginable pain. The system failed her family — and it can fail others too if we don’t act.”

Whitney’s Law, named for the girls’ mom, has over 6,000 signatures as of Tuesday afternoon.

The new legislation would mean the alert system includes all at-risk children, whether or not the parent is the abductor.

Activist Tamara Emerson led a rally for change to the system at Seattle’s City Hall in June, according to radio show KIRO-FM.

“Sometimes we wait until harm occurs to put protections in place,” Emerson said.

“But if there are risk factors, children should be protected.”

Shortly after the girls were found suffocated to death at Rock Island Campground, Whitney called for reforms for the state’s Amber Alert system and said her veteran ex-husband was a “broken” man.

Arianna Cozart, Whitney’s attorney, who she allowed to speak on her behalf, told NBC affiliate KING at the time that text alerts would have put the community on the lookout for Decker’s white pickup truck and the girls, which might have made a difference.

MOM’S PRIORITY

The Endangered Missing Persons Advisory doesn’t immediately send out a text to all cell phones in the area, which an Amber Alert would have done.

Cozart said Wenatchee police recognized Decker’s mental instability and noticed the red flags in him not returning the girls or answering his phone, but cops still couldn’t convince Washington State Patrol to issue an Amber Alert.

“It’s very important to Whitney to get that fixed,” Cozart said.

Each state has its own Amber Alert plan.

In June, State Representative Brian Burnett showed his support for the idea of Whitney’s Law. Burnett didn’t immediately return The U.S. Sun’s request for comment.

The hunt for Travis Decker has lasted over nine weeks.

Police recently said they were scaling back their search efforts due to the decreasing number of tips and resources.

However, a former FBI agent told The U.S. Sun the announcement might be a ploy to flush Decker out of his wilderness hiding.