continues for loved ones who may be trapped. this as investigators try to figure out what caused the deadly blast. cnn's leyla santiago has more. >> reporter: christine and migu miguel, it is the unknown that is feeding the anxiety and desperation for families still searching for their loved ones. it is also the unknown that is fueling the investigation for a lot of people here that are sorting through the debris trying to figure out exactly what caused the explosion. the state government officials are not commenting on that right now. they have told me they are focusing on the dozens of victims that they are now trying to support as a result. we should mention that this is a massive market. about ten football fields and 300 vendors. all of which the government tells me had permits at the time of the explosion.