BAGHDAD — A wave of bombings across Iraq striking busy markets and a funeral north of Baghdad killed at least 44 people Wednesday, authorities said, as the country remains gripped by violence after al-Qaida-linked militants took control of two cities in western Anbar province.

There was no immediate claim of responsibility for the attacks. Insurgent groups, mainly al-Qaida’s local branch and other Sunni militants, frequently target civilians in cafes and public areas, as well as Shiites and members of Iraqi security forces in an attempt to undermine confidence in the Shiite-led government and stir sectarian tensions.