The interim Iraqi government says it is going to propose a nationwide arms amnesty next week in a bid to bring rampant violence in the country under control.It comes as a series of roadside blasts and car bombs claimed more lives in recent days. Several civilians were killed on highways around Baghdad as insurgents targeted American troop convoys. In the capital itself an explosion at a cafe used by Iraqi police killed at least eight people and wounded 28. A car bomb went off in traffic in the northern city of Mosul, killing five and wounding 15. Meanwhile the Iraqi government continues to threaten an assault on Falluja in a bid to capture or kill leading militants.