A college received threat of placing of bomb hours before the commencement of Chemistry paper of PUC supplementary examination on Thursday. The Rajajinagar police said a lecturer of the KLE College received the call on his mobile phone around 8 a.m. He immediately informed the college principal and also called the police. The Rajajinagar police came to the college along with personnel from bomb detection squad. The police searched the college premises and found the call to be hoax.