Six children were taken to hospital after Friday's incident but two boys, aged 13 and 14, died.
The US president will join the Queen and a host of royals at a state banquet after a palace welcome.
Deputy Assistant Commissioner Laurence Taylor said the Met wants a prosecution of each protester.
Senior cabinet ministers expect the PM to outline a timetable on Friday for her successor to be chosen.
A Cornwall dog owner had the skin torn off her middle finger by a lead wound tightly round her hand.
The US is hoping to extradite the Wikileaks co-founder, who is currently in jail in the UK.
The competition regulator says that four drugs firms forced the price of an anti-nausea tablet up by 700%.
UK voters will elect 73 Members of the European Parliament from 12 constituencies.