India's foreign minister Monday criticised international reaction to last month's Mumbai attacks, saying pressure put on Pakistan by world leaders was inadequate. Pranab Mukherjee told India's ambassadors that he wanted to see more results from US-led attempts to force Pakistan to co-operate with the probe into the attacks, which India blames on Pakistan-based militants. "There has been some effort so far by the international community but this is not enough," Mukherjee told the envoys, called to New Delhi from the around the world to discuss the Mumbai attacks. Asked whether India was still considering a military response to the attacks, he said India would "explore all options" to force arch-rival Pakistan to follow through on its promise to crack down on cross-border terrorism.