A large library in Montreal will be closed until Tuesday morning in the wake of a hacking attack on Quebec's public daycare registration website. The Bibliothèque et Archives nationales du Québec (BAnQ) says it has temporarily shut down some of its computer systems. The personal data of 5,000 parents and children was compromised. The Treasury Board says the hack took place due to unspecified vulnerabilities in the software. The website was developed by Montreal-based InMedia Technologies, according to a client list posted on its website.