Stock futures fell Monday, weighed by the U.S.′ latest warning against Iran, after the major U.S. benchmarks posted their fourth-straight weekly slide.

Dow Jones Industrial Average futures

were 395 points lower, or 0.87% down, at 3:50 a.m. ET. S&P 500 futures

shed more than 1%, and Nasdaq-100 futures

drop almost 1.2%.