DUBAI, United Arab Emirates (AP) — Three weeks into an escalating war in the Middle East, Iran threatened to expand its retaliatory attacks to include recreational and tourist sites worldwide, as the U.S. announced it was sending more warships and Marines to the region.

Following news of the deployments, President Donald Trump said later Friday on social media that his administration in fact was considering “winding down” military operations in the region. The mixed messages came after another climb in oil prices plunged the U.S. stock market, and was f...