Syrian rebels have attacked key military targets and over-run two police stations in Aleppo, killing 40 officers, an observer group says.
Clashes between the rebels and loyalists of President Bashar al-Assad were also reported in the capital Damascus, the eastern city of Deir Ezzor and Daraa in the south, cradle of the more than 16-month uprising.
The Syrian Observatory for Human Rights said Aleppo was on Tuesday rocked by the fiercest fighting of a military offensive on rebels in the city, which came after the government had warned of a looming “mother of all battles”.