At least one member of GREAT WHITE testified Tuesday before a grand jury deciding whether criminal charges should be filed in the deadly nightclub fire sparked by the band's pyrotechnic display, according to the Associated Press. Also Tuesday, relatives of two of the 98 people killed in the Feb. 20 blaze filed what is believed to be the first lawsuit filed in the tragedy. The band's guitarist, Mark Kendall, told WBZ-TV of Boston he had testified briefly before the grand jury and expected to return. Kendall and bassist David Filice were seen leaving the National Guard facility in East Greenwich where the grand jury has been meeting. The band's lawyer, Ed McPherson, would say only that band members are cooperating fully. Investigators have said the fire at The Station nightclub in West Warwick started when sparks from GREAT WHITE's pyrotechnics ignited the polyurethane soundproofing, spreading flames that engulfed the building in a matter of minutes. Among those killed was GREAT WHITE guitarist Ty Longley. Members of the band have said they had permission to use the fireworks, a claim the club's owners deny.