The Syrian Observatory for Human Rights reports a large explosion near Damascus International Airport followed by a fire. The Syrian government says Israel struck the military site with several missiles. Israeli Intelligence Minister Yisrael Katz states that the strike "corresponds completely with Israel's policy".
The Pentagon rejects a Russian proposal to stage joint airstrikes against Al-Qaeda linked groups in Syria. [https:--web.archive.org-web-20160521120605-http:--www.voanews.com-content-pentagon-rejects-joint-strikes-with-russia-3339269.html (VOA News)] [https:--www.reuters.com-article-us-mideast-crisis-russia-usa-syria-idUSKCN0YB1HB (Reuters)] [http:--www.huffingtonpost.com-entry-russia-proposes-joint-syria-airstrikes_us_573f28bce4b0613b512a0751 (Huffington Post)]War on Terrorism