There have also been a few instances where tribe members suspected of working for the United States have been killed, with warning letters left on their bodies.
"After this time," the letter read, "all the shops are going to be burned, and if anyone stays behind to protect them, they will be killed without warning".
Hard-to-detect aneurysms can kill without warning.
Atherosclerosis, the buildup of fatty deposits on the walls of major arteries, can kill without warning.
"The separatists are shooting to kill without warning against the approaching special forces," he said, He later said Ukrainian forces had been attacked at a checkpoint on the way to Sloviansk, and at least one officer had been killed and five others wounded.
One month ago today innocent citizens from more than 80 nations were attacked and killed without warning or provocation in an act that horrified not only every American but every person of every faith and every nation who values human life.
When its author, J. Anthony Lukas, killed himself without warning shortly before an 18-city cross-country tour arranged for him by the publisher, several of his friends volunteered to promote "Big Trouble" on the broadcasting and television circuits and even in bookshops.
Russia has called for "targeted strikes" on Ukrainian territory after an alleged shelling across its border killed a civilian, warning the attack could have "irreversible consequences".
PETA urged Florida authorities to allow only the use of firearms or captive bolt guns think Javier Bardem in "No Country for Old Men"—to kill snakes, warning that decapitation can leave the beheaded reptiles writhing in pain for hours.
They said the Peruvian military plane had opened fire without warning, killing the missionary's wife and infant daughter.
