Timeline: A look at tensions between U.S., Iran since 2018

Iran is sending mixed signals as tensions with the U.S. appear to ease. President Hassan Rouhani has warned of a “very dangerous response” if the U.S. makes “another mistake,” and a senior commander has vowed “harsher revenge” for the killing of a top Iranian general.

Both sides appeared to step back after Iran launched ballistic missiles Wednesday at two military bases housing American troops in Iraq without causing any casualties.

Iran said the attack was retaliation for the U.S. strike that killed Gen. Qassem Soleimani earlier this week. An Iranian general said his forces had prepared to launch “hundreds” of missiles but only fired 13.

Here is a timeline of U.S. and Iran tensions dating to 2018. AP will update the timeline as major events warrant.