Iraq's President Jalal Talabani says nearly 1,100 people were killed in Baghdad last month in sectarian violence.
Mr. Talabani said in statement Wednesday that morgues reported 1,091 people were killed in the capital alone between April 1 and 30.
The statement said the leadership feels "shock, dismay and anger" over the daily reports of unidentified bodies being discovered in and around Baghdad.
Earlier Wednesday, Iraqi police said insurgents ambushed and killed 11 bus passengers and wounded three others near Baquba, north of the capital.
On Tuesday, 17 people were killed and 35 others wounded in a suicide car bomb attack at a market north of Baghdad, in Tal Afar - a city that President Bush cited earlier this year as an example of progress in fighting insurgents.
Prime Minister-designate Nouri al-Maliki is working to complete formation of his Cabinet in time to seek parliament's approval of a new national unity government later this week.
U.S. officials say a unity government that represents all Iraqi factions is key to stemming bloodshed and averting civil war.
Some information for this report was provided by AFP and AP.