REPUBLIKA.CO.ID, BEIRUT - Syria's government and opposition accused each other of launching a deadly chemical attack near the northern city of Aleppo on Tuesday in what would, if confirmed, be the first use of such weapons in the two-year-old conflict.

US President Barack Obama, who has resisted overt military intervention in Syria, has warned Assad in the past that any use of chemical weapons would be a "red line". There has however been no suggestion of opposition group possessing such arms.

Syria's information minister said opposition had fired a rocket carrying chemical agents that killed 16 people and wounded 86. State television said later the death toll had risen to 25.

The pro-opposition Syrian Observatory for Human Rights, which monitors the conflict using a network of contacts in Syria, put the number of dead at 26, including 16 soldiers.

The reported death toll is far below the mass slaughter inflicted on the Iraqi Kurdish city of Halabja where an estimated 5,000 people died in a chemical attack ordered by former Iraqi President Saddam Hussein 25 years ago.

There was no immediate confirmation from Western governments or international organizations of a chemical attack, but Russia, an ally of Damascus, accused the opposition of carrying out such a strike.

"We are very seriously concerned by the fact that weapons of mass destruction are falling into the hands of the rebels, which further worsens the situation in Syria and elevates the confrontation in the country to a new level," the Russian Foreign Ministry said in a statement.

Meanwhile Britain and the US are looking for the evidence of people responsible for the chemical attack. Britain said its calculations would change if a chemical attack had taken place.

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