A total of about 1,000 police officers were deployed in and around the government district of Berlin on Thursday, a spokeswoman said, in order to police the state ceremony to mark the 75th anniversary of Germany’s constitution. The police were also out on the Spree river on patrol boats and had deployed a helicopter. The Federal Criminal Police Office (BKA) and special task forces (SEK) from the Berlin State Criminal Police Office and from Lower Saxony were also involved. The situation was calm and relaxed in the morning, police said. A total of 1,100 guests were expected on the square in fron…