The United Nations Security Council has authorized an expanded political mission in Afghanistan to strengthen support for the government as the country confronts increasing insurgent violence.

The resolution was approved unanimously by the 15-member council.

Italian Ambassador Marcello Spatafora said the mission was "sharpened" to improve coordination with international civilian and military efforts, based on Secretary-General Ban Ki-moon's recommendation.

"Not only are we extending UNAMA's mandate for further twelve months, we are also offering to the mission clear guidance on the priorities to take forward within the mandate."

The resolution expresses concern about "increased violent and terrorist activities by the Taliban, al-Qaida, illegally armed groups, criminals and those involved in the narcotics trade."

The council first established the UN Assistance Mission in Afghanistan, or UNAMA in 2002.

It provides technical help, political and strategic advice and other support for the Afghan government.

Other areas include promoting human rights and managing aid for people struggling to rebuild their lives.