The closure of 21 United States embassies across the Middle East and Africa -- the widest such closure in US history -- demonstrates the "War on Terror" is far from over. As the threat that inspired the closures indicates, the "war" is unlikely to be concluded in the foreseeable future.
The war in Iraq has, from a US perspective, all but concluded and Afghanistan is starting to wind down. But both remain sites of conflict and will remain so as internal and regionally inspired factions compete for politico-religious control. Syria, too, has increasingly become the site for intra-religious conflict, rather than simply a civil war against a despised dictator.
The unspecified threat against an embassy was intercepted in Yemen, the key base for al-Qaeda in the Arabian Peninsula. While effectively independent of other al-Qaeda-named organisations, AQAP is regarded as perhaps the most dangerous of its offshoots.