Malaysia has stepped up security at its borders in case Malaysian militant fighters try to return home after Iraqi forces launched a major offensive to take back the Islamic State stronghold of Mosul, deputy prime minister Ahmad Zahid Hamidi said on Tuesday.
Iraqi government forces launched a U.S.-backed offensive on Monday to drive Islamic State from the northern city of Mosul, the group's last major stronghold in Iraq.
Around 4,000 to 8,000 militants, a mix of Iraqi and foreign fighters, are estimated to be in the city.
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