National Public Relations Inc., Toronto, has purchased Toronto-based Sonic Boom Creative, a full-service interactive agency that has partnered with brands such as Sirius Satellite Radio, Jamieson Laboratories, TIMEX, and Honda on a array of interactive initiatives. National says the acquisition will help the company respond to escalating client demand for a seamless, integrated and innovative digital approach to complement overall communications strategies. Sonic Boom will continue to operate as Sonic Boom and will move into National’s Toronto office within months.