The city of San Francisco has put a policy on hold that would permit police to deploy armed robots to deal with emergency situations. The city’s Board of Supervisors voted eight to three last week to approve the measure. On Tuesday, however, the board voted to temporarily ban the use of such robots. Board members sent the issue back to a committee for more discussion. They could vote on a new measure in the future permitting use of armed robots. The policy, considered by the San Francisco Police Department, planned to arm robots with explosives, not guns. Supporters of the policy said it would permit armed robots to be used only in life-threatening situations in which other police methods had failed. The measure was strongly opposed by several rights groups and police oversight organizations. Opponents warned that the policy would open the door to future militarization of the police force. They also said it would likely lead to more conflict between police and citizens in poor and minority communities.