Three American servicemen with the International Security Assistance Force (ISAF) in Afghanistan have been reported killed in separate incidents.
Poland's defence ministry also said one of its nationals had been killed and four wounded in the east.
A Polish defence ministry statement said one of its captains was missing in action overnight but found dead on Monday and four other Polish soldiers wounded after they were caught in a firefight during a foot patrol with Afghan troops.
In southern Kandahar province, four civilians were killed and 16 others wounded when roadside bombs struck two cars, the interior Ministry said.
With a presidential and provincial poll just nine days away, violence has escalated across Afghanistan, making 2009 the deadliest year since the Taliban were ousted in 2001.
Homemade bombs planted in the road are by far the most lethal weapon deployed by Taliban insurgents frequently killing civilians as well as foreign and government troops.
Early this month the Taliban posted "night letters - posters pasted in mosques and on village walls - warning voters not to leave their homes on polling day.
Reuters