US 'ready' to launch Syria strike, says Chuck Hagel

American forces are "ready" to launch strikes on Syria if President Barack Obama chooses to order an attack, US Defence Secretary Chuck Hagel says.

His words come as US Secretary of State John Kerry said there was "undeniable" proof that Syria used chemical weapons.

Syrian Foreign Minister Walid Muallem has said he rejects "utterly and completely" claims that Syrian forces used chemical weapons and his government has blamed rebel fighters.

Jon Sopel reports from Brunei.