Several countries also conducted national exercises involving key emergency response agencies, with many conducting tabletop or functional exercises to test their tsunami warning and emergency response Standard Operating Procedures.
During a second phase, implemented simultaneously after receipt of warning messages, the authorities of the countries involved will test all the necessary steps to respond to a warning prior to alerting the public.
White House spokesman Brian Cullen said the United States does "reserve the right to transit international waters, " but also declined to say whether U.S. forces will test China's warning.
CNN: U.S. official avoids direct response to China's warning on Taiwan
The latest full-scale test of the Indian Ocean Tsunami Warning and Mitigation System had taken place on 12 October 2011.
North Korea characterizes the satellite launch as a peaceful bid to explore space, but says the nuclear test was meant as a deliberate warning to Washington.
The investigation did discover that BP's rig supervisors and crew members from Transocean had not carried out a crucial safety test properly, missing an important early warning that the pressure was too high and the well was about to rupture.
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It aims to test the effectiveness of alert, monitoring and warning systems among all the emergency management organizations (national focal points for tsunami alerts, weather forecast offices, national coast guard, etc.) throughout the region.
Even when news stories play it straight down the "he says, she says, " line, who, as a parent, are you going to believe: the company protesting that its toy, usually assembled in China, is just fine and dandy, or the "watchdog" group warning that it's frighteningly dangerous and waving a test to prove it?
The success of this first test paves the way for the establishment of regional tsunami warning centres.
Following the success of the communication test exercise of 10 August 2011 involving 31 National Tsunami Warning Focal Points from the region, a full-scale exercise named NEAMWave12 is planned in the fourth quarter of 2012 to test the readiness of the system and of the Member States.
Tension between Pyongyang and its neighbor South Korea has increased in recent weeks, with North Korea announcing it would scrap peace agreements with the South, warning of a war on the Korean Peninsula and appearing ready to test a missile capable of hitting the western United States.
Channel TV said it had hired special devices to test the laser lighting for ITV and had given a verbal warning at the beginning of every programme.
The North issued a similar warning before testing a long-range missile in April, but that warning indicated two potential danger areas more indicative of a long-range missile test.
With around four years to go at that point, it is doubtful that red warning signals were flashing over the 2014 hosts Brazil. (Some may argue that with the test event of a Confederations Cup in 2013 the organizers had less time).
FORBES: Why The IOC Should Be Very Worried About FIFA And Brazil 2014
The latest warning came after Rodong Sinmun, a state newspaper, carried an essay on Saturday saying that a nuclear test was "the demand of the people".
Smith says that one test in the U.K. found 80% of time, people would surrender after seeing the warning arc, without an officer actually having to fire the device.
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