UN Secretary General Ban Ki-moon said Friday he "strongly condemns" the terrorist attack in Lebanon that killed Lebanon's top anti-terrorism investigator. "This latest act of terror should not be allowed to undermine the security, stability and sovereignty of Lebanon," said Ban, who called on the people of Lebanon "to continue exercising restraint and for those behind this and previous attacks to be brought to justice." Ban also extended "his sincere condolences to the families of those killed and the government of Lebanon." A car bomb explosion in eastern Beirut on Friday killed at least four people including Lebanon's top anti-terrorism investigator while he was returning from a meeting on the probe into the 2005 assassination of a former prime minister. At least 38 others were wounded, police said.