At least 10 police have been killed in Pakistan and six more wounded when gunmen attacked a police station in the country’s north-west, officials said on Monday. The attack came amid an uptick in violence ahead of this week’s national elections. The gunmen overran the police station in the town of Dera Ismail Khan in a pre-dawn attack, local official Mohamed Afzal said. He said the attackers first threw hand grenades at the building before starting a gun battle with the police that lasted for several hours. The attack, the deadliest in weeks, came days ahead of pakistan’s national elections, s…