The German foreign ministry yesterday issued an "urgent regional security warning" for the nations where radical Islamist groups are active.
It referred to the recent threat by IS to attack the interests of those nations participating in the international coalition to fight the jihadists in Iraq and in Syria.
In view of this threat, "it cannot be ruled out that Western nationals in a foreign country could become the targets of terrorist attacks, kidnappings and criminal offences by IS sympathisers," the ministry said.
The ministry urged the public to be very vigilant, to avoid large crowds and to follow the instructions of local security authorities.
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The warning comes just days after IS called upon Muslims to kill nationals of those nations participating in the international coalition against the jihadists.
Countries listed as having increased risk of terrorist attacks and kidnappings are Afghanistan, Algeria, Bahrain, Bangladesh, Burkina Faso, Chad, Djibouti, Egypt, Indonesia, Israel, Iraq, Iran, Yemen, Jordan, Cameroon, Kenya, Kuwait, Lebanon, Libya, Malaysia, Mali, Morocco, Mauritania, Niger, Nigeria, Oman, Pakistan, the Philippines, the Palestinian territories, Qatar, Saudi Arabia, Senegal, Somalia, Sudan, Syria, Thailand, Tunisia and the United Arab Emirates.