Baghdad (CNN) -- Two men were killed and four other people were wounded in Baghdad over the last 24 hours, authorities said.
Men carrying pistols with silencers intercepted and attacked a car carrying a father and son in the Saydiya neighborhood in southwestern Baghdad, an official with Iraq's Interior Ministry said. The son was killed and the father was critically wounded.
Gunmen opened fire on the vehicle of an employee at Iraq's parliament in central Baghdad on Monday evening and killed a man identified as Khader Rasool, according to an Interior Ministry official and the parliament press office.
An employee at the Foreign Ministry was wounded on Tuesday when a roadside bomb attached to his car detonated in western Baghdad, the official said.
Similar attacks -- using guns with silencers and sticky bombs attached to vehicles -- have been on the rise in recent weeks.
And in northern Baghdad, two civilians were wounded on Tuesday when a bomb struck an American military convoy in Baghdad, Interior Ministry sources told CNN.
There were no American military casualties, the U.S. military said.
Violence has dropped in Iraq since the height of the war earlier this decade but attacks still erupt frequently.
CNN's Mohammed Tawfeeq and Jomana Karadsheh contributed to this report.