Turkey looks to construct more walls along its border with Syria an an additional measure against illegal border crossings and to strengthen security against possible attacks by the self-proclaimed Islamic State in Iraq and Syria (ISIS), Reuters and the Milliyet daily reported on Saturday.Turkey shares a more than 900 km (560 mile) border with Syria, and much recent fighting has taken place on its doorstep. The country has already erected more than 10 km of walls along its borders, supported by additional measures such as thermal cameras.Now, the government wants to add to that and is considering adding portable concrete walls in some locations, two officials told Reuters. The portable walls, which are made up of concrete slabs, can be taken down and reassembled in different locations. According to the Milliyet daily, the wall will be 3,5 meters in height.Turkey has kept an open-border policy throughout Syria's civil war and has vowed to maintain it, providing a lifeline to rebels battling President Bashar al-Assad by allowing supplies in and refugees out.According to the Milliyet daily,the Interior Ministry has already started to work on the project in cooperation with the governorships of border provinces of Gaziantep, Kilis, Hatay and Şanlıurfa.