(CNN) -- At least 20 people were killed across Iraq in shootings and explosions on Wednesday, police officials in Baghdad and Mosul told CNN.
The deadliest attack occurred in western Baghdad when a roadside bomb exploded on a busy road, killing four people and wounding 11 others.
Earlier in the day, a separate suicide attack near a police checkpoint in al-Rutba in Anbar province toppled a bridge, killing four police officers and three truck drivers. The attacker also died, authorities said.
This came after attacks on security checkpoints in the same town on Tuesday left at least 12 police officers dead and 24 wounded, police said.
Al-Rutba is a predominantly Sunni Muslim community that for a few years was an al Qaeda stronghold after the 2003 U.S.-led invasion of the country.
Sunnis, who represent a minority of Iraqis, have felt politically marginalized since the overthrow of Saddam Hussein in 2003 by Shiites, who outnumber them.
Six people died Wednesday in violence in Mosul. Details on the other deaths were not released.
CNN's Salma Abdelaziz contributed to this report.