How to run sql scripts from a pl sql procedure

I have a procedure like :

CREATE OR REPLACE PROCEDURE test is 
BEGIN

  DBMS_OUTPUT.PUT_LINE('This is a Test');
END;

I want to run some sql scripts stored in the current directory. I could run them from sqlplus with '@scriptname.sql' but how can i do it from inside the procedure ? For ex:

CREATE OR REPLACE PROCEDURE test is 
BEGIN

  DBMS_OUTPUT.PUT_LINE('This is a Test');
  @scriptname.sql

END;

This doesn't seem to work ! Is there a specific to run sql scripts from pl/sql procedures ?