Secretary of State Mike Pompeo made a surprise visit to Baghdad today, to talk up an ongoing US military buildup in the region, targeting neighboring Iran. The US has deployed a carrier strike group and B-52 bombers to the region. 

The buildup is being justified by the US citing vague, non-specific threats against US forces. These appear to originate from Israel's Mossad, who informed the US they think it's possible Iran might attack US targets in the area.

US officials were only too willing to believe this, and the mention of Iranian proxies possibly being involved immediately led to extra tension targeted at Iraq's Shi'ite militias, which the US and Israel have both accused of being in league with Iran.

These same militias, however, are part of the Iraqi government's own security structure. This is likely to raise concerns within Iraq, and Pompeo's meeting with PM  Adel Abdul Mahdi doesn't seem likely to resolve the questions.