(Updates toll) BAGHDAD, Dec 25 (Reuters) - A car bomb killed at least 10 people and wounded 15 when it exploded on a busy commercial street in a mainly Shi'ite district of Baghdad, police said. The bomb, triggered by remote control, targeted shoppers on the main street of the New Baghdad district, the police source said. The road has been a frequent target for militants. Insurgents have often targeted Shi'ite strongholds in central Iraq with bombings as part of a wider sectarian conflict that threatens to spark all-out civil war and undermine a Shi'ite-led government of national unity.