(see related story) Rome, July 3 - Ferrari's Fernando Alonso said he was confident Sunday's German Grand Prix will be safe after a series of tyre explosions at last weekend's race at Silverstone in Britain raised alarm that Formula One drivers' lives could be on the line. Tyre supplier Pirelli said on Tuesday that an investigation had showed the blowouts were caused by a series of factors, including teams putting tyres intended for the right rear on the left side of their cars and inflating them to lower pressures than recommended. The Italian company said that its tyres were safe if used correctly, but had nevertheless decided to take stronger rear tyres to this weekend's German Grand Prix and introduce a new range by the time of the Hungarian Grand Prix later this month. "After what we saw in Silverstone, we now go to the Nurburgring, confident we can see an improvement," said Spain's Alonso, a two-time world champion. "I know that various modifications have been applied and let's hope that means all of us drivers can race in safe conditions. "At the moment, we can't make any predictions, because no one has tried them and we don't know what and how many benefits they can bring, apart from trusting in the fact that it won't be dangerous to race".