German prosecutors say a Pakistani asylum seeker who had been detained in the Berlin Christmas market attack has been released. <br /><br /> The Chief Federal Prosecutor’s office said it did not have enough evidence. “The investigation up to now did not yield any urgent suspicion against the accused,” it said in a statement.<br /><br /> The 23-year-old had made extensive statements during a police hearing, but had denied the offence, it added. <br /><br /> Earlier the authorities said they were not sure whether he was the perpetrator of the attack.<br /><br /> A dozen people were killed and 48 injured, 18 of them seriously, when a lorry ploughed into stalls serving mulled wine and sausages in the heart of the German capital.<br /><br /> “It is possible that there is still a dangerous perpetrator on the run and of course people are worried. I believe people who live in this city should be vigilant,” Berlin’s police chief Klaus Kandt said during a news conference on Tuesday lunchtime.<br /><br /> He said police also thought it possible there might be more than one suspect.<br /><br /> The prosecutor’s office said in its later statement that it had been impossible to track the truck driver by eye-witnesses following the attack, and the investigation had not been able to prove that the suspect was in the truck’s cab at the time of the attack.<br /><br /> Police say a man found dead in the lorry was a Polish national, adding that he had not been in control of the vehicle. He is believed to be the original truck driver. <br /><br /> Germany’s interior minister Thomas de Maizière said a pistol believed to have been used to kill him had not yet been found.<br /><br /> Security measures are now being tightened around Christmas markets and other seasonal events in Berlin and elsewhere in Germany. Police with machine guns will patrol Christmas markets in the capital.<br /><br /> In Dresden concrete blocks were put in place to prevent vehicles from entering the market.<br /><br /> As Germany mourns, flags have been flying at half mast.<br /><br /> The authorities say people should not give in to terrorism by changing their plans – and should still attend seasonal events to celebrate Christmas.<br />
