When a fire forced dozens of homeless people to leave their tents in Chicago's South Loop neighborhood, Jackie Rachev at the local Salvation Army was ready to welcome them. Little did she know a Good Samaritan was paying to put them up in hotel rooms. It's been brutally cold in Chicago, with temperatures of 20-25 below zero on Wednesday. The homeless encampment near the Dan Ryan Expressway was heated by 150 to 200 portable propane tanks -- many of them donated by generous citizens. Shortly after noon, one of the tanks in the tent city exploded because it was too close to a space heater. That left city officials with no option but to close the encampment. Rachev said she received a call from the city asking her to help provide shelter for around 70 people. But later she got another call saying it was no longer necessary -- because a Good Samaritan had offered to pay for hotel rooms. The Salvation Army was prepared to welcome approximately 70 individuals who were affected by the explosion, but was notified those services were not necessary as the individuals were already being taken of," Rachev told CNN. "We are thrilled that they are safe and warm." Rachev said she did not know the identity of the Good Samaritan or which hotel the homeless people were booked in.