MISHAWAKA, Ind. -- In this quiet space, the children's section of the Mishawaka Library, a librarian found a note. "We did receive a threatening note. The note came in late June, and we have been working on it with the Mishawaka Police Department," said David Eisen, Director of Mishawaka Penn Harris Public Library. ABC 57 spoke with Mishawaka Police who say that now a second letter has been found. Just this week, on Tuesday, also found in the children's section by a librarian. Mishawaka Police say that it's because of security cameras inside the library that they have been able to identify a suspect. "We are taking it very seriously and we are probably going to have some security here, some extra security," says Eisen. "The library does employ extra security guards at night, but just in case something may turn up we are trying to have extra security." "When we do receive threats we do take them seriously and we are going to investigate them and find out if they are real or not, until we find out the results of that we take them and believe that they are going to be real," said Lt. Tim Williams, PIO of Mishawka Police Department. Police and library officials stress that Penn Library will operate as normal tomorrow, but with added security and that patrons of the library have nothing to worry about.