UNITED NATIONS/BEIRUT (Reuters) – Russia and the United States tangled on Tuesday at the United Nations over the use of chemical weapons in Syria as Washington and its allies considered whether to strike at President Bashar al-Assad’s forces over a suspected poison gas attack last weekend.

Moscow and Washington halted attempts by each other in the U.N. Security Council to set up international investigations into chemical weapons attacks in Syria, which is in the throes of a seven-year-old civil war. Read more.