Prime Minister Harper called yesterday’s shootings in Ottawa at the War Memorial and Parliament Hill a terrorist attack, and vowed to strengthen Canada’s antiterrorism laws. The attacker, Michael Zehaf-Bibeau, was shot dead by security officials after he had fatally shot a Canadian soldier and fired shots inside Parliament. It is still unclear whether Zehaf-Bibeau, who was said to be inspired by the Islamic State, acted alone. Canada raised its terrorist threat level from low to medium on Oct. 16 after deciding to join the coalition air campaign against the Islamic State, and security at military bases and other facilities has been increased following the two terrorist attacks this week.