Toronto:
Canadian police were on high alert after a Toronto man was charged on Wednesday with possession of explosives in what police are calling a Group of 20 summit-related arrest.
Officers armed with a search warrant went to a million-dollar-plus home in a wealthy neighbourhood in Toronto's north end and charged Byron Sonne, 37, with several offences, including possession of explosives, dangerous weapons, intimidating a justice system participant and mischief, police said in a statement.
Sonne made two brief court appearances on Wednesday and his bail hearing was put off until Wednesday.
Police said the investigation is part of the ongoing effort to ensure a safe and secure G-20 Summit in Toronto this weekend.
The G-20 groups the leaders from 19 leading rich and developing nations and the European Union.
Meanwhile hundreds of noisy G8 and G20 protesters rallied in downtown Toronto, in the third-straight day of demonstrations in advance of the meetings of the world's leaders.
It was the largest protest of the week, and the most tense as demonstrators at one point went face-to-face with police, who tried to keep the group of about 350 people at bay.
Protesters taunted officers with anti-police slogans, as they angrily marched through city streets with banners that denounced what they call environmental injustice.
More than 100 officers on motorcycles, bicycles and foot responded by lining together to form a human shield in an effort to keep the demonstration from spilling over onto businesses and homes.
In the end, the protesters disbursed peacefully after about three hours and there were no incidents that resulted in arrests.
Wednesday's demonstrators were a varied group of objectors from Montreal and cities across Ontario.
Their target was the Alberta tar sands, the BP oil spill, mining by companies such as Barrick Gold and global warming.
One protester cover himself in tar sands oil to highlight the plight of the sea life that was dieing due to the BP oil spill in the Gulf of Mexico.
Security has been tight in Toronto, with a highly visible presence of police.
Toronto's police chief has said 5,100 officers have descended on the city to keep the peace.
Rob McDonald, a police constable with the Toronto Police said their primary concern was the, "protection of its citizens, protection of our guests to the country and if people want to protest that it is done fairly and safely."
Many workers have stayed home to avoid the downtown core, and the usually bustling banking district is deserted.
The G8 meets on Friday in the central Ontario community of Huntsville and the G20 gathers Saturday and Sunday in Toronto.
A leaked draft of the G20 communique indicates that international development and climate change have seized a large part of the group's agenda.
This is apparently happening despite Prime Minister Stephen Harper's hopes of limiting the summit discussions to the global economy.
The June 11 draft shows the G-20 countries want to fight the underlying causes of the recent financial crisis and work together on tougher banking regulations.
But the commitments are vague, and brackets suggest many details are yet to be worked out as negotiators meet tonight and Thursday in advance of the weekend summit in Toronto.
The three-page draft dedicates two full paragraphs to climate change, committing countries to investing in green technology and doing whatever they can to boost international talks for a climate-change pact in Mexico at the end of this year.
The countries also agree to set up a working group dedicated to eradicating poverty and helping developing countries, even though Harper has argued that the G8 is where development talks belong, since the biggest donors run the smaller group.