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How to display posts under the parent taxonomy but not under the child taxonomy

Found out the answer by myself

Here is the new code which displays posts only from the parent category and not the child categories

if (is_tax()) {
    if (get_query_var('securityproducts_categories')) {
        $taxonomy_term_id = $wp_query->queried_object_id;
        $taxonomy = 'securityproducts_categories';
        $unwanted_children = get_term_children($taxonomy_term_id,
        $unwanted_post_ids = get_objects_in_term($unwanted_children,
        // merge with original query to preserve pagination, etc.
        query_posts( array_merge( array('post__not_in' =>
$unwanted_post_ids), $wp_query->query) );
 while ($wp_query->have_posts()) : $wp_query->the_post(); ?>

// Your code


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