Good idea to close embassies if there is a threat I guess but when do you open them back up, when is the threat over?

"The United States is closing all of its embassies Sunday in the Middle East and parts of Asia because of a possible al-Qaeda-related threat to diplomatic posts worldwide, American officials told NBC News on Thursday.
The U.S. has been "apprised of information that out of an abundance of caution and care for our employees and others who may be visiting our installations, that indicates we should institute these precautionary steps," said State Department spokeswoman Marie Harf.

She didn't say which or how many embassies would be closed or what kind of information led to the decision, but she said the closings could be extended, "depending on our analysis." Possible al-Qaeda threat closes all US embassies Sunday across Middle East - World News