Belgian police released video footage from the shooting attack at the Jewish Museum on Saturday.
""From the images we saw, we can conclude that the terrorist acted alone and was well prepared," a spokeswoman for the Brussels prosecutor's office told reporters. "It is still too early to know whether this was a terrorist attack or an anti-Semitic attack, all possibilities are still open.".
• Mira and Emmanuel Riva from Tel Aviv were murdered at the Jewish Museum in Brussels
Security around Jewish institutions in Belgium has been raised to the highest level. About half of the country's Jewish community lives in Brussels.