Here is a list of the coalition countries including the new ones announced last night.
Full list of coalition countries:
Afghanistan, Albania, Australia, Azerbaijan, Bulgaria, Colombia, the Czech Republic, Denmark, El Salvador, Eritrea, Estonia, Ethiopia, Georgia, Hungary, Iceland, Italy, Japan, South Korea, Latvia, Lithuania, Macedonia, the Netherlands, Nicaragua, the Philippines, Poland, Romania, Slovakia, Spain, Turkey, United Kingdom and Uzbekistan.
Additions: Costa Rica, Dominican Republic, Honduras, Kuwait, Marshall Islands, Micronesia, Mongolia, Palau, Portugal, Rwanda, Singapore, Solomon Islands, Uganda
Source: BBC