The Oakland cops suck.
The reference to “IRA” style attack is to the ‘double bombing’ strategy developed at some point by the IRA and mimicked later by Eric Rudolph and I’m fairly certain now used in Iraq and Afghanistan. Pull the fire alarm and when the fire trucks come shoot at them. (That was an analogy. Pulling the firearm is a bomb, shooting at them is a second bomb that is set to go off where you know the police will park their cars when they arrive.)
From Christopher Harmon’s Terrorism Today page 104: