Local police in DeSoto, Texas - an area close to Dallas - held a press briefing after shootings at two separate locations in the town left four people dead and four others wounded. 

"I believe there was an explosive device used,'' a spokeswoman for the DeSoto, Texas, police said at a briefing.

No additional details were given as to what kind of device was believed to have been used, but the spokeswoman said the FBI, ATF and other agencies had been brought in to investigate. 

Get more details on FoxNews.com.