A police officer and a woman have been killed near Parliament in central London in what Scotland Yard are treating as a terrorist incident. The woman was among several pedestrians struck by a car on Westminster bridge, before it crashed into railings. An officer was stabbed in the Houses of Parliament by an attacker, who was shot by police. March 22;http://www.bbc.com/news/uk-39355940
A chart for the recent solar eclipse of 26 February at London has the Jupiter-Mars-Uranus-Pluto T-square straddling the meridian. At the core of this T is the long term Uranus-Pluto square, the defining aspect of the decade. Uranus is the planet of mental awakening through shock. Its very nature is disruptive aiming to arouse us from our sleeping state. As an urge in our psyches, Uranus has little respect for the status quo, and none whatsoever for existing power hierarchies. This is the planet of revolution—anarchy as a temporary way of challenging or breaking down hardened structures whose vital time has passed.
Pluto, on the other hand, is not mental at all. It is the power of emotion—deep, unconscious, primal, and often compulsive emotions. It dredges the depths, brings to the surface what is hidden, dying, sick, or festering, and transforms or transfigures.
In summary, working together Uranus-Pluto can bring revolutionary action aimed at the collapse of existing power structures.
Mars-Uranus-Pluto is a violent combination. Ebertin includes the keywords “injury and accidents” under this combination. Conjunct Mars and Uranus is the asteroid Phaethon (car) so as in a previous accident  a car is involved in the incident.
So what is it that triggered the eclipse T-square? Well on March 22, transit Moon, always an important trigger, conjoined apex Pluto in the T setting it off like a bomb!