Thursday's toll surpassed the mark of 45 killed on Aug. 22 as gang violence continues to plague the Central American country of 6 million people.
Authorities have said the surge in violence is a result of a government crackdown that has led to gunfights between police and criminals, as well as gang battles over territory.
Police yesterday also reported finding the body of a slain police officer the 45th officer this year to die at the hands of gangs. Sixteen soldiers and six prison guards also have been killed.