MEXICO CITY (Reuters) - The Mexican government said on Saturday it had no register of unaccompanied migrant children entering the country in response to a media report that U.S. officials have been sending back foreign minors to Mexico in breach of joint accords. The New York Times reported on Friday that U.S. border authorities have been expelling migrant children from other countries to Mexico, fueling tensions on an issue that has strained U.S.-Mexico ties under the Trump administration. Mexico’s government reacted by saying it would look into the report, but has not confirmed any cases. “At present there is no register of minors entering Mexican territory without being accompanied by their relatives,” Roberto Velasco, a senior foreign ministry official, wrote on Twitter.