A roadside bomb planted by Taliban militants targeted a Pakistani security patrol on Monday, killing at least five police officers guarding health workers on a polio vaccination, officials said. The attack in the north-west of the country was the deadliest in years on the UN-funded drive. The bombing occurred in the militant region of Bajaur near the country’s border with Afghanistan, local police official Kareem Khan said. More than 20 people, mostly officers, were wounded by the bomb that hit the patrol in the morning, Khan added. The Pakistani Taliban, a group different from their Afghan co…