At least 40 asylum seekers are being investigated over suspected terror links in Germany, police say, also warning that the threat of attacks across Europe remains high. The Federal Criminal Police Office (BKA) has received 369 tips-offs on possible links between refugees and extremists since the start of the migrant crisis in Germany, the Neue Osnabrücke Zeitung reported on Wednesday. Some of the tip-offs turned out to be credible. Police decided to open at least 40 cases against those suspected of being members of terrorist organizations, who may be involved in the preparation of serious attacks. The BKA warned the terror threat in Europe and Germany remains high. “More attacks by Islamist terrorist cells can’t be excluded,” a BKA official told the paper.The Germany Interior Ministry reacted to the report, telling the newspaper that most of the tips-off were groundless. It added that sometimes such ‘terrorist’ tip-offs were made by other asylum seekers in revenge. Wolfgang Bosbach, an MP in Angela Merkel’s Christian Democratic Union (CDU), says Germany has problems with the registration of refugees. “The dangers that arise from this must be taken very seriously - that is something that the attacks in Brussels and Paris have made clear to us,” Bosbach told the paper. An overwhelming 1.1 million asylum seekers arrived in the country in 2015, and more are to come in 2016. On Monday, the Federal Office for Migration and Refugees (BAMF) said it is planning to process over a million asylum applications this year. The Neue Osnabrücke Zeitung report is not the first to claim refugees coming to Europe may be terrorists in disguise. In October 2014, US sources told Bild Am Sonntag that Islamic State (IS, formerly ISIS/ISIL) militants were planning to insert operatives into Western Europe masquerading as refugees. Fighters using fake passports would travel to European countries to conduct attacks, according to the report.