How many casualties were in the earthquake with an unknown intensity and an epicenter in the bou ra province?
CREATE TABLE table_name_3 (
    casualties VARCHAR,
    intensity VARCHAR,
    epicenter VARCHAR
)
SELECT casualties FROM table_name_3 WHERE intensity = "unknown" AND epicenter = "bouïra province"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many casualties were in the earthquake with an unknown intensity and an epicenter in the bou ra province? ### Input: CREATE TABLE table_name_3 (
    casualties VARCHAR,
    intensity VARCHAR,
    epicenter VARCHAR
) ### Response: SELECT casualties FROM table_name_3 WHERE intensity = "unknown" AND epicenter = "bouïra province"