German Chancellor Olaf Scholz on Saturday visited the site of a car-ramming attack on a crowded Christmas market that killed five people and injured more than 200 as he called for unity while condemning the “terrible catastrophe.”Police arrested a 50-year-old Saudi doctor of psychiatry at the scene, next to the battered SUV that had ploughed through the festive crowd on Friday night, leaving a trail of carnage and bloodied casualties.A somber Scholz, dressed in black, was joined by national and regional politicians in the eastern city of Magdeburg, where they laid flowers outside the main church.For all the latest headlines follow our Google News channel online or via the app.He pledged that Germany would respond “with the full force of the law” to the attack but also called for unity as Germany has been rocked by a heated debate on immigration and security as it heads towards elections in February.The center-left chancellor said it was important “that we stick together, that we link