Russia has carried out five consecutive air strikes targeting a refugee camp in a neighbourhood in Idlib, according to UK-based human rights group the Syrian Observatory for Human Rights (SOHR). The strikes killed at least one civilian and have injured others, the monitor says.

Syrian rebels launched a surprise attack on Saturday and quickly advanced through several provinces in the north and northwest of Syria, including the city of Aleppo, the country’s second largest city.

Syrian and Russian jets are stepping up strikes on opposition forces in northern Syria in retaliation for the sudden offensive that has cost the regime control of the country’s second largest city, Aleppo.