Security around the Canadian High Commission in Bangladesh was tightened Friday after it received faxed letters threatening a suicide bomb attack, Reuters reported. The Australian High Commission and the U.S. Embassy received identical threats from an Islamist military group called Jemaah Islamiyah al-Qaeda, prompting officials to tighten security around Dhaka's diplomatic zones. The Islamist group ordered the missions to close within a week or face a suicide bomb attack. Dhaka police suspect the threats are linked to Jamaat-ul-Mujahideen Bangladesh, an Islamist group that wants to turn the country into a sharia-based Islamic state. Police say they traced the fax messages to a Malaysian number and immediately informed the Malaysian government.