The announcement came after other Palestinian officials said the talks had been postponed due to Egypt's closure of the Rafah border crossing with the Gaza Strip, the only crossing into Gaza not controlled by Israel, after a bomb attack by a suspected militant on its troops in the Sinai Peninsula on Friday killed 30 soldiers.
Egypt also imposed a state of emergency on parts of the Sinai, which also borders Israel.
"The indirect talks between Israelis and Palestinians have been postponed until the second half of November," said Ahmad.
There was no immediate confirmation from Israel.
Earlier, Hamas official Khalil al Haya addressed his militant movement's television that Palestinian delegates cannot leave Gaza since Egypt has closed the Rafah crossing.
Last week, Hamas deputy leader Mussa Abu Marzuk said indirect talks with Israeli negotiators for a durable ceasefire in Gaza would resume on Monday.
The talks are aimed at building on an August 26 ceasefire that ended a devastating 50-day summer war between Hamas and Israel in the Gaza Strip.
The conflict killed more than 2,140 Palestinians, most of them civilians, and 73 on the Israeli side, mostly soldiers.
Hamas and other Palestinian factions, including the Fatah movement of president Mahmud Abbas, are taking part in the Egyptian-mediated indirect talks alongside Israel, and had a first round of negotiations last month.
The Palestinians are demanding that the talks lead to a lifting of an eight-year blockade imposed by Israel on Gaza, including the opening of a port and an airport -- demands rejected by Israel.
Palestinians barred from Israeli West Bank buses
Palestinians will be effectively banned from riding the same buses as Israeli settlers in the West Bank, Haaretz Daily reported on Sunday, with a rights group slamming the plan as "racial segregation".
Hundreds of Palestinians travel each day to work in Israel from the occupied West Bank, mainly in the construction business, using a single crossing point at Eyal where they present travel permits.
Currently they are allowed to return to the West Bank on the same buses as Israeli settlers.
But the new measure announced by Israeli Defence Minister Moshe Yaalon, due to go into effect next month, will require them to again check in at the Eyal crossing point, the Haaretz Daily reported.
The workers would have to find separate transportation from that point on.
The directive in effect "bans Palestinian workers from traveling on Israeli-run public transportation in the West Bank," said Haaretz.
The Defence Minister was not immediately available for comment.
Israeli settlers in the West Bank have called for years for Palestinians to be banned from public transport there, arguing their presence poses a security risk.
But Haaretz reported that the bus ban contradicted the view of the Israeli army, which does not see Palestinian commuters on Israeli transport as a threat, since the workers go through security vetting before receiving their travel permits.
Israeli rights group B'Tselem accused Yaalon of making the racially motivated decision.
"It is time to stop hiding behind technical arrangements and admit this military procedure is thinly veiled pandering to the demand for racial segregation on buses," a group statement said.
Last year, the group criticised the Israeli government for its decision to launch separate bus lines for Palestinians in the occupied West Bank.
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