School bus drivers should watch for suspicious items and behaviors. Suspicious items may be abandoned, leaking, or have exposed wires or threatening messages. Potentially suspicious items include canisters, propane tanks, boxes, or out-of-place objects. Suspicious behaviors include abandoning an item and leaving quickly, showing unusual interest in people or locations, being where one shouldn't, or possessing weapons. If something suspicious is seen, drivers should immediately report the item's location and description to authorities without touching it or using devices near it.