WASHINGTON — The United States has withdrawn a low-level negotiating team from Pakistan in the latest sign that talks to reopen NATO supply routes into neighboring Afghanistan remain stalemated, American officials said Monday.

Withdrawing the team, made up of technical specialists, was not a political slap at the Pakistanis, but rather a practical necessity, the officials said. The team had been in Pakistan for 45 days and is returning home while higher-level political bargaining continues.

A senior American official said Monday that talks on reopening the supply routes would continue, but it was unclear when the technical team would return to Pakistan.

“The talks have not collapsed,” said the official, who was not authorized to speak publicly on the deliberations. “They have come to the point where there is no reason for them to stay because they have gone as far as they can. When they have come to the point where a political decision is made, they can come back to tidy up the pieces.”