NEW DELHI (AFP) Indian Prime Minister Manmohan Singh said that this week's attack in Delhi served to remind everyone that the country urgently needed to boost its intelligence gathering abilities. "The terrorist attack in Delhi last Wednesday is a stark reminder to us that there can be no let-up in our vigilance," Singh on Saturday said during an address to a multiparty gathering on national integration, three days after a bomb ripped through a crowd outside the High Court, killing 13 people. "We must continuously upgrade and strengthen our investigating agencies and our intelligence gathering apparatus to deal more effectively with the newer methods and technologies" adopted by terrorists, he said. Singh's government has come under fire over India's apparent inability to prevent bombings of high-profile targets in its cities, despite an overhaul of domestic security following the 2008 Mumbai attacks.