"Then [after the investigation] we have to examine very carefully if and where there is a need for additional legal actions," de Maiziere told Bild am Sonntag newspaper.
Germany’s Vice Chancellor Sigmar Gabriel said earlier in the day Germany must restrict access to deadly weapons.
On Friday, an 18-year-old German-Iranian man opened fire in a crowded Munich shopping mall and a nearby McDonald`s restaurant, killing nine people and wounding 27 others before committing suicide.
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