U.S. intelligence agencies disagreed on whether Russian President Vladimir Putin would order military intervention last week in Ukraine, officials said Tuesday, and the House Intelligence Committee is examining what caused the differing analyses.

“We have begun a review to see what pieces were missing here,” said Mike Rogers (R-Mich.) who chairs the House Intelligence Committee.

Lawmakers who read the competing intelligence analyses say they were given little guidance of what to believe, and were surprised last Friday when the Russians began taking control of border posts, airports and regional government facilities in Crimea.

A classified report earlier in the week by the Pentagon’s Defense Intelligence Agency, responsible for collecting and analyzing military intelligence, concluded that Russian military drills with 150,000 troops near the Ukrainian border would not provide a pretext for sending troops into Crimea.