The US consulate in Istanbul said on Tuesday it had canceled consular services for Wednesday due to "information about a possible security threat" against the mission, Reuters reported.
"We strongly encourage US citizens to maintain a high level of vigilance, be aware of local events, and take the appropriate steps to bolster your personal security," the consulate added in a statement on its website.
Other US diplomatic missions in Turkey, in Ankara, Izmir and Adana, will operate normally, the statement said. It did not elaborate on the possible threat.