Insurgent attacks in several parts of Afghanistan have killed 10 police officers over 24 hours, officials said on Wednesday.
Warming weather in the summer usually brings an uptick in insurgent activity, but the surge this year is more than expected.
Data from the NATO military coalition in Afghanistan show that attacks increased sharply in May compared with same time of year in 2011, from around 2,500 incidents to around 3,000. Statistics for June were not yet available.
In the south, four officers were killed when they responded to an explosion in Musa Qala district today, said provincial spokesman Daoud Ahmadi.