MAZAR SHARIF: Nine Afghan employees of a Czech aid organisation were killed when militants attacked their guesthouse in northern Afghanistan early on Tuesday, officials said.

“Those killed in Zari district of Balkh province include seven aid workers, six men and one woman, and two guards,” deputy provincial police chief Abdul Razaq Qaderi told AFP, blaming the Taliban for the attack.

The victims were employees of People in Need (PIN), a Czech organisation which has been delivering humanitarian aid around Afghanistan since 2001.

“Unfortunately last night unknown armed men attacked our guesthouse in Zari and martyred nine of our employees,” a PIN official told AFP, requesting anonymity.

No group has so far claimed responsibility for the killings but the attack comes as the Taliban intensify their annual spring offense despite repeated overtures from the government about reopening peace negotiations.

International aid workers have increasingly come under attack in Afghanistan despite the Taliban espousing an official policy that rejects attacks on humanitarian workers.

The latest attack comes just weeks after 14 people, mostly foreigners, were killed in a Taliban attack on a guesthouse in downtown Kabul popular with international aid workers.

Official efforts to bring the Taliban to the negotiating table have so far borne little fruit.

The surge in attacks has taken a heavy toll on civilians, according to the United Nations Assistance Mission to Afghanistan.

In the first four months of 2015, civilian casualties jumped 16 per cent from the same period last year, it said.

President Ashraf Ghani's government has drawn criticism for failing to end growing insurgent attacks, which critics partly blame on political infighting and a lengthy delay in appointing a candidate for the crucial post of defence minister.

Ghani last month nominated Mohammad Masoom Stanekzai, a top official in the government body overseeing the country's peace process, for the job.

The post had been left vacant for months due to disagreements between Ghani and his chief executive officer and former presidential election rival, Abdullah Abdullah.