The probes by Al Qaeda continue...
Some of these incidents are no doubt innocent, but I believe we are seeing an attempt to cramp up the system without going to the trouble of actual attacks. Also, there may be hope that repeated false alarms will cause security to loosen.
Could be one of many Islamo-Fascist groups... could be with funding from Iran as well. I gotta' feeling that after Israel's pathetic showing in Lebanon... the wheels are turning faster now.