A school was placed in lockdown this morning after a teacher was attacked. Two teenagers have since been arrested. Alarms went off and emergency procedures were put in place while the incident was dealt with at around 11.15am. One student, spoke to Teesside Live and said: "We were in third lesson and all of a sudden the lockdown alarms started going off and all the classrooms got locked. Everyone was like 'what's going on?' "Then we saw one of the teachers bleeding and crying - there was blood