here"We apologise for the message sent to our students last night about posters in windows, it didn't reflect the University's view," the tweet read."We respect the rights of students to express themselves, but as requested by Greater Manchester Police the posters must not break the law or they'll have to be removed."Students said the first they knew of the lockdown at the halls of residents was when security guards appeared at the front gates.Megan Tingey, 19, is a fresher at Birley.She tested