Investigators are seeking whoever tried to firebomb a South Lake Tahoe marijuana collective on 4-20 eve.The Tahoe-Douglas Bomb Squad was called in by South Lake Tahoe police and firefighters after the 10:15 incident at 2314 Highway 50.The investigation revealed an improvised explosive device was thrown into the business through a window causing minor property damage. The device caused a small fire and it's unclear if it functioned as intended. The business was closed to the public at the time the device was discovered, however there were two employees working inside. Neither of the employees was injured in the incident.The specific …