How to include Drop index in PL/SQL

Hi,
In my PL/SQL, I put a drop index statement in between, but it gave me an error of
"PLS-00103: Encountered the symbol "DROP" when expecting one of the following:
begin declare exit for goto if loop mod null pragma raise
return select update while <an identifier>
<a double-q"
My statement is structured as:
DECLARE
BEGIN
DROP INDEX index_name;
COMMIT;
END;
Why is this error occuring? When I execute the drop index statement seperately it is ok. When i put it in the PL/SQL it gave me error.
Do I need special syntax to include a Drop index statement in a PL/SQL?
Thanks

Any DDL commands in PL/SQL must be executed using dynamic SQL:
execute immediate 'drop index index_name';

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Greetings from sdohn

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          in (select owner as obj1, index_name as obj2
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