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_251272_4 ( year INTEGER, location VARCHAR )

### Question ###
What is the first year where the assassination attempt was at Martyrs' Mausoleum, Rangoon, Burma?

### Accurate SQL ###

SELECT MIN(year) FROM table_251272_4 WHERE location = "Martyrs' Mausoleum, Rangoon, Burma"