NEW : U.N. secretary - general accepts the Arab League envoy 's resignation . He was referring to President Bashar al-Assad 's regime . Syrian opposition and the government agreed to a truce last night . On Monday , government troops fired upon an opposition neighborhood in Damascus . On Tuesday , rebels shelled two pro - government neighborhoods in Damascus , opposition says .
NEW : U.N. secretary - general accepts the Arab League envoy 's resignation . Syrian opposition and the government agreed to a truce last night . On Monday , government troops fired upon an opposition neighborhood in Damascus . On Tuesday , rebels shelled two pro - government neighborhoods in Damascus , opposition says .