The number of Iraqi civilians killed in acts of violence in May was the highest monthly tally so far this year, figures released on Tuesday showed.

Overall, 337 people - 275 civilians, 45 police and 17 soldiers - died as a result of attacks in May, according to data compiled by the health, interior and defence ministries.

The total number was only slightly higher than last month's total of 328, but more than double May 2009's toll of 155.

The previous high for civilian deaths this year was 274 in April.

A total of 718 people - 520 civilians, 141 police and 57 soldiers - were wounded last month.

The figures also showed that 55 insurgents were killed and 660 arrested.