 The unnamed men  in their 40's and 50's  were arrested after security officials at the plant discovered traces of the explosive substance on a plastic bag inside a bag one of the men were carrying.
<fluency>  The unnamed men  in their 40's and 50's  were arrested after security officials at the plant discovered traces of the explosive substance on a plastic bag inside a bag one of the men were carrying.
 The unnamed men in their 40's and 50's were arrested after security officials at the plant discovered traces of the explosive substance on a plastic bag inside a bag one of the men was carrying.