Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

DALLAS (July 23, 2015) (GLOBE NEWSWIRE) -- MoneyGram (NASDAQ:MGI), a global provider of innovative money transfer services, warns customers to stay alert for imposter scams in which fraudsters posing as federal agents or other government officials demand money in return for not pursuing or pressing criminal charges related to taxes, traffic tickets or other unpaid debts.

Answer: headquarters_location: MoneyGram, DALLAS