1. Investigators are putting thousands of packages under intense scrutiny across Texas and appealing for help from the public after a string of mysterious bombings in the state.

All five were improvised devices hidden in packages. The latest detonated early Tuesday at a FedEx facility near San Antonio, above, leaving an employee with ringing in the ears. The authorities believe the sender shipped a second suspicious package, which was turned over to law enforcement.

Both packages were addressed to Austin, where the previous blasts — two of them lethal — occurred. Here’s a breakdown of each case.