Authorities in the Dominican Republic say the death toll from an explosion at a plastics company has risen to four.

A statement from the National Health Service also says that the number of injured has risen to 66, with five people in critical condition following Wednesday’s blast in the capital of Santo Domingo.

The sub-director of the Emergency Operations Center told The Associated Press on Thursday that two people are still missing. Edwin Olivares also said that officials have not been able to identify two of the four victims.

He said many workers survived the large explosion at the Polyplas company because they followed security protocols.

Business owner Manuel Diez Cabral tweeted that 98 percent of staff members were evacuated following what he said was an “uncontrollable” gas leak.

Source: The Associated Press