MUMBAI, India (CNN) — The terrorist attacks that killed more than 180 people in Mumbai last week has strained India’s already tenuous relationship with Pakistan, as India investigates its neighbor’s alleged ties to the massacre.Pakistan says India has yet to offer any proof.“So far what has been shown has been unjust,” Rehman Malik, head of Pakistan’s Interior Minister, told CNN.A captured suspect has told investigators that he is Pakistani, Indian officials said. The suspect, who Indian authorities say is the only surviving suspected gunman, also said he was trained by Lashkar e Toiba, a Pakistan-based terror group allied with al Qaeda, sources told CNN’s sister station, CNN-IBN.Indian officials allege that in the 1990s, Lashkar e Toiba was a state-sponsored terror group that the Pakistani government used to get control of the disputed northern Kashmir region. Pakistan banned the group in 2002.Sources also told CNN-IBN that the captured suspect said he and the other attackers were told to memorize Google Earth maps of Mumbai’s streets so they could find their targets.Meanwhile, the Indian government is considering suspending the five-year-old cease-fire with Pakistan and perhaps even ending the dialogue process with the country, CNN-IBN reported.Pakistani security officials told CNN that if tensions with India escalate, it may shift its military forces from the Afghan border east to prepare for any conflict.On Saturday, Pakistan’s foreign minister, Shah Mahmood Qureshi, vowed to take action against any group within its borders if it is found to be involved with the attacks.And Malik told CNN: “If anybody has used our soil, I give assurance and I assure my friends and people from India that we will take action.”The 60-hour wave of violence began Wednesday night as gunmen surged into at least nine locations in Mumbai, killing at least 183 people and wounding about 300.The official death toll does not include at least 11 gunmen...