(The terror plot to blow up U.S.-bound airliners with liquid explosives was thwarted, but the threat level has still been raised to "HIGH.")
I don't think I've seen and heard such profuse usage of the word "thwart" in my entire life. Count how many times you see/hear that verb today, you'll be amazed. Things that TSA has thwarted: Carry-on luggage, beverages, shampoo, lotion, sunscreen, toothpaste, hair gel, and lip gloss.
Synonyms for thwart: bar, block, hinder, impede, obstruct; arrest, check, halt, stop; forestall, obviate, preclude; negate, neutralize, nullify; counteract, offset; conquer, defeat, overcome, put the kibosh on. (Merriam-webster.com)
The situation could've been much worse, but don't say that to poor Code Red today.