On the 16th anniversary of the deadliest terrorist attack on American soil, fresh evidence submitted in a major 9/11 lawsuit moving forward against the Saudi Arabian government reveals its embassy in Washington may have funded a “dry run.”

Two years before the airliner attacks, the Saudi Embassy paid for two Saudi nationals, living undercover in the US as students, to fly from Phoenix to Washington “in a dry run for the 9/11 attacks."

The amended complaint was filed on behalf of the families of some 1,400 victims who died in the terrorist attacks 16 years ago.

The court filing provides new details that paint “a pattern of both financial and operational support” for the 9/11 conspiracy from official Saudi sources, lawyers for the plaintiffs say.

Lawyers representing Saudi Arabia last month filed a motion to dismiss the lawsuit, which may finally be headed toward trial now that Congress has cleared diplomatic-immunity hurdles.

A federal judge is now waiting on the plaintiffs to respond.