When the November 2015 Paris attacks took place, the whole of Europe—and the US—went on high alert and ramped up security, as they've certainly had to do once again after this week's attacks in Brussels. 
Shambulizi la Novemba 2015 la Paris lilipotokea, maeneo yote ya Ulaya na Marekani waliingia kwenye tahadhari kubwa na kuimarisha ulinzi, kama ambavyo walivyopaswa kufanya kwa mara nyingine mara baada ya kutokea kwa shambulizi la wiki hii huko Brussels.