Dutch police said on Wednesday they were investigating whether the man believed responsible for last week's deadly Christmas market attack in Berlin may have travelled through the Netherlands .

Twelve people died in the Dec. 19 attack . The Tunisian suspect , 24-year-old Anis Amri, was shot dead Dec. 23 by Italian police .

Netherlands national police spokesman Wim de Bruin said there were "signs" 24-year-old Amri had passed though the Netherlands on his way to France, and an investigation was ongoing.