Obama : ` ` Let us strengthen our resolve against those who perpetrated this violent act '' Family , friends of those killed in attacks read out in solemn prayer calls . Former Secretary of State Colin Powell speaks at Pennsylvania site . Events take place in New York , at the Pentagon and in Philadelphia , Pennsylvania .
Obama : `` Let us renew our resolve against those who perpetrated this violent act '' Family , friends of those killed in attacks read names in solemn roll calls . Former Secretary of State Colin Powell speaks at Pennsylvania site . Services take place in New York , at the Pentagon and in Shanksville , Pennsylvania .