As investigators continue to try to piece together what led to the weekend crash of a tour bus that killed 14 people, victims of the crash are filing lawsuits. A second suit claiming negligence was filed yesterday in Chicago. The bus was on its way to Tunica, Mississippi, from Chicago when it crashed Saturday morning in east Arkansas north of West Memphis. Also yesterday , community members packed a South Side Chicago church for a memorial service to remember the victims and offer support to their family members. National Transportation Safety Board investigators are looking at the bus and gathering other information to try to root out the cause of the accident. The roof of the bus tore off when it rolled. Inspectors said the bus had a second roof installed, adding hundreds of pounds to the bus` weight. Investigators stopped short of saying the retrofit of the roof was a factor in the accident.