BAGHDAD (Reuters) - A bomb planted in a busy market in the Iraqi town of Mahmudiya, south of Baghdad, killed at least seven people and wounded 21 on Friday, police said. The explosion shattered a relatively calm holy month of Ramazan, which ends this weekend and has been a favourite target in past years. It struck just as town residents were shopping for food to break their fast. Police gave no further details. Sources at a local hospital confirmed the death toll. Despite persistent violence, Iraqis have been venturing out in the evening this Ramazan and many say they feel safer than they have for years. But the blast in Mahmudiya, 30km south of Baghdad, was a reminder of the security woes Iraq faces six-and-half-years after the US-led invasion to oust Saddam Hussein.