Allstate Corp. says catastrophe losses for the month of May costthe insurer $323 million pre-tax primarily from seven lossevents.

The Northbrook, Ill.—based insurer says 90 percent of the lossesfrom the seven events came to an estimated $312 million. A companyrepresentative declined to specify the losses.

Major U.S. catastrophe events in May included the tornadoes thatripped through the Midwest, spawning the EF5 tornadoes in Moore andEl Reno, Oklahoma, and potentially causing insurers $4 billion inlosses; and Colorado's Black Forest Fire, which has destroyed about509 homes in the most destructive wildfire in statehistory.

Allstate estimates April pre-tax losses of $216 million,bringing the total for the two months to $539 million.

Last year, Allstate posted $820 million in pre-tax losses forthe second quarter of 2012, although the sum also includes $440million stemming from June events. Last year's losses came from 30events that cost an estimated $960 million, a number offset byfavorable re-estimates of prior catastrophes.