A woman who lost her husband in a terror attack in Jordan claimed by ISIS is suing Twitter for helping the terror group spread its message online.

Tamara Fields, who lost her husband Lloyd in a Nov. 9 shooting attack, filed suit against the social media firm in California on Wednesday. “Without Twitter, the explosive growth of ISIS over the last few years into the most-feared terrorist group in the world would not have been possible,” the complaint said, Reuters reports.

The suit alleges that Twitter knowingly allowed ISIS to use the social network to recruit, spread its message and fundraise. Lloyd “Carl” Fields was a government contractor and one of five killed by a policeman in a “lone wolf” attack, which ISIS later claimed credit for.

“While we believe the lawsuit is without merit, we are deeply saddened to hear of this family’s terrible loss,” Twitter said in a statement. “Violent threats and the promotion of terrorism deserve no place on Twitter and, like other social networks, our rules make that clear.”

[Reuters]

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Write to Julia Zorthian at julia.zorthian@time.com.