Just saw on Pakistan's Mansoor Ali Khan channel that indeed the US Desk of the Pakistani Foreign Office is very active and that negotiations have been on the table at least for last 8+ days with Turkey, Egypt and Pakistan in the lead but Pakistan chosen to be the venue because of the trust level enjoyed by all concerned, compared with other mediators.
The upcoming discussions in Islamabad were supposed to be a strict secret but of course nothing that happens in America stays a secret from Israel and so the Israeli media disclosed it, with the aim to sabotage the talks.