The suit filed in New York alleges that Twitter gave Islamic State militants a "strong and unique means of communication" that allowed them to carry out their attacks and spread propaganda | Josh Edelson/AFP via Getty Images Terror victims’ families file suit against Twitter It allowed ISIL ‘strong and unique’ propaganda channel, families of victims from Brussels and Paris attacks say.

Families of the victims of terror attacks in Brussels and Paris have launched legal action against Twitter, accusing the social media platform of not doing enough to prevent radical Islamic extremists using the site, the news agency Belga reported Tuesday.

The suit filed in New York alleges that Twitter gave Islamic State militants a "strong and unique means of communication" that allowed them to carry out their attacks and spread propaganda. The plaintiffs accuse the social media company of trampling on U.S. anti-terrorism legislation.

Twitter also faces legal action from the families of three men killed in an attack on a nightclub in Orlando, Florida in June 2016. They claim the company, along with YouTube and Facebook, provided ISIL with accounts the group used to spread propaganda, raise funds and attract new recruits.

In August 2016, a U.S. federal judge dismissed a case brought forward by families of American contractors Lloyd Fields and James Creach, who were killed by the Islamic State in Jordan in 2015. The families alleged Twitter was legally liable for causing the men’s deaths. In its ruling, the court relieved Twitter of liability for posting information provided by others and stated there was no clear evidence the killer had been radicalized by ISIL propaganda posted on social media.

While rejecting the legal claims in the suit, Twitter has since cracked down on the use of its service by Islamic radicals, closing more than 125,000 accounts found to have ISIL ties.