Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_3 (casualties VARCHAR, intensity VARCHAR, epicenter VARCHAR)

### Question ###
How many casualties were in the earthquake with an unknown intensity and an epicenter in the bouïra province?

### Accurate SQL ###

SELECT casualties FROM table_name_3 WHERE intensity = "unknown" AND epicenter = "bouïra province"