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Israel has urged Turkey to release an Israeli couple charged with espionage for allegedly taking photos of the presidential residence in Istanbul.

Natalie and Mordi Oknin, who are bus drivers from Modiin, were arrested last week after being reported by staff at a restaurant in the Camlica Tower.

A judge ordered that they should be remanded in custody pending trial.

Their Israeli lawyer called the charges "groundless" and Israel insisted they did not work for any Israeli agency.

"These are two innocent civilians who have been mistakenly caught up in a complex situation," Prime Minister Naftali Bennett said on Sunday. "I spoke yesterday with the family and we are doing everything to resolve the issue."

Relations between Israel and Turkey have been strained since a deadly 2010 Israeli raid on a Turkish ship trying to break Israel's blockade of Gaza.

Turkey's state-run Anadolu news agency reported on Friday that an Israeli couple and a Turkish citizen were arrested after staff at the restaurant of the 369m-tall (1,211ft) Camlica TV and Radio Tower of President Recep Tayyip Erdogan's residence.

Mr and Mrs Oknin were questioned by prosecutors before being referred to a court, where a judge charged them with "political and military espionage" and extended their detention for at least 20 days.

, telling Israel's Haaretz newspaper that "their only offence involves their photographing Erdogan's palace during an innocent boat trip".

He identified the building as the waterfront Dolmabahce Palace. It has not been used as a presidential residence for decades, although parts of it are reportedly used as a presidential working office. The current residence, the Huber Mansion, is located elsewhere in the city.

Israeli President Isaac Herzog said he was "convinced" of the couple's innocence and emphasised that they did "not work for an Israeli agency".

On Monday, Foreign Minister Yair Lapid tweeted that Israeli officials were working "around the clock" to secure Mr and Mrs Oknin's release.

The foreign ministry also announced that .

Last month, Turkish media reported that 15 men had been arrested by Turkish authorities on suspicion of spying for Israel's Mossad intelligence agency. A former Mossad deputy director denied they were Israeli spies.