New Delhi, India (CNN) -- Indians marched for peace, prayed and laid wreaths Friday in memory of the Mumbai terror attack as the nation's prime minister vowed renewed efforts to track down those behind the assault, which is blamed on Pakistan-based militants. "We will never succumb to the designs of our enemies. We pledge to redouble our efforts to bring the perpetrators of this crime against humanity to justice," Prime Minister Manmohan Singh said in a statement issued as the nation remembers the dead from the November 2008 siege of India's financial hub. The attack derailed the fragile peace process between nuclear-capable arch-foes India and Pakistan. Under U.S. pressure, the two neighbors resumed talks this year in a bid to restart a full dialogue, but progress has been slow.
@highlight
Prime minister: "We will never succumb to the designs of our enemies"
@highlight
164 people were killed in the attack, which lasted three days
@highlight
Ten gunmen stormed hotels, a train station and a Jewish center
@highlight
Nine of them were killed; the other was captured
He has been convicted of murder, conspiracy and waging war against @placeholder.