Mr Johnson told those gathered that those responsible for the violence "face punishment they will bitterly, bitterly regret".
But Mr Johnson said Mr Cameron had exposed his party as opponents of NHS investment.
The trust urged Mr Johnson to use his new term to tackle a "growing childcare crisis".
Replacing the bitter, divisive Mr Brown with the calm, well-liked Mr Johnson is an attractive prospect.
"I wish to God there was something that I could do, " says Mr Johnson.
"We're trying to see if people can fit into bridesmaids' dresses, " Mr Johnson said.
Scotland is considering similar measures, and in Wales the health minister is examining Mr Johnson's comments.
Mr Johnson said this would also "fulfil" his aim of making London's air cleaner.
But Mr Johnson told the BBC, Starbucks was showing "corporate responsibility" and the issue was "difficult".
Mr Johnson would bring a familiarity with the food and drinks side of the business.
Mr Johnson met Conservative candidate Maria Hutchings and joined her going door-to-door to meet constituents.
As governor, Mr Johnson showed that a non-ideological, pragmatic libertarianism can work as a governing philosophy.
Body scanners are to be introduced at Heathrow Airport in about three weeks, Mr Johnson said.
There are important differences between the ways Mr Johnson and Mr Livingstone have approached the mayoralty.
Mr Johnson voted against the last of these and against the Gulf war in 1991.
To get there, though, cyclists will have to start looking less like Mr Johnson.
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Mr Johnson replaces Daniel Moylan, who had been appointed to the role in May.
Mr Johnson put forward the proposals for participation in European Car-Free day to Tuesday's cabinet meeting.
"We woke up to the flames coming out of the skylight, " said Mr Johnson.
It is not the first time Mr Johnson has spoken about his desire to be prime minister.
Dr Webb asked how voters could make informed choices if Mr Johnson would not produce "concrete" proposals.
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Mr Johnson has a point, but his campaign is one part aviation and one part raw politics.
Like Mr Cameron, Mr Johnson spent his teenage years wandering around Eton in a white bow tie.
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In his letter sent last month, Mr Dalziel recognised Mr Johnson's awareness of the audit's initial findings.
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But Mrs May hit back at Mr Johnson's claims, saying Labour was in an "utter state of denial".
"It's really just an expectation now, people demand speed and they demand quality and convenience, " Mr Johnson said.
Mr Johnson said the flight was rescheduled for 11:00 GMT, but was later cancelled due to the snow.
"Parents will know how well their child is doing in moving through the different levels, " said Mr Johnson.
But Mr Johnson took the unprecedented step of directing it to move towards a consultation on cost-cutting measures.
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Mr Johnson also asked how Mrs May would "safeguard the independence" of chief constables under the new system.
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