Two law firms filed suit against the government of Libya on Tuesday, seeking more than $4.9 million in unpaid legal fees and costs related to defense work in a slew of terrorism-related cases.

Paris-based Cabinet Sefrioui and Washington, D.C.’s Law Offices of Arman Dabiri & Associates claim Libya failed to make good on a 2008 settlement agreement in which it promised to pay about 3.7 million euros, or roughly $4.9 million, to law firms that handled lawsuits accusing the country of supporting terrorist attacks, including the 1988 bombing of Pan American Flight 103 over Lockerbie, Scotland.