A week of heavy fighting between security forces and the Islamic State jihadist group in the Ramadi area of Anbar province killed 30 police, a top officer said on Monday.

"The city of Ramadi witnessed heavy confrontations and fighting last week between security forces" and IS, Anbar police chief Staff Major General Kadhim al-Fahdawi said, putting the toll at 30 police killed and 100 wounded.

The first troops from Saudi Arabia's National Guard have been deployed on the border with Yemen, official media said late on Sunday.

They will join members of the border guard and the army who have reinforced the frontier since March 26 when a Saudi-led coalition began air strikes against Shiite Huthi rebels and their allies in Yemen.

Two Saudi Air Force pilots were killed on Sunday when their training aircraft crashed, the defense ministry announced.

"A training aircraft from the King Faisal Air Academy has had an accident. The aircraft crashed, killing an instructor and a student pilot," the official SPA news agency quoted a ministry spokesman as saying.

The Islamic State jihadist group killed two senior officers and 10 other soldiers in a suicide bombing and heavy fighting in Iraq's Anbar province, a general said on Saturday.

"The commander of the 1st Division, Staff Brigadier General Hassan Abbas, and the commander of the 1st Brigade of the 1st Division, Staff Colonel Hilal Matar, and 10 soldiers were killed and 10 wounded," Staff Major General Mohammed al-Dulaimi said.

U.S. Secretary of State John Kerry called Friday on Shiite Huthi rebels in Yemen and those who have "influence over them" to come to the negotiating table and end the unrest in the Gulf nation.

"This has to be a two-way street," Kerry told reporters, saying Saudi Arabia was moving to a humanitarian phase of its Yemen campaign and "we need the Huthi and we need those that can influence them to make sure that they are prepared to try to move... to the negotiating table."

Yemen's influential former president urged his rebel allies Friday to heed U.N. demands to withdraw from territory seized in months of fighting, so Saudi-led air strikes can end and reconciliation begin.

Ali Abdullah Saleh, who still holds sway over army units allied with the Iran-backed Huthi rebels who now control large swathes of the country, had welcomed this month's Security Council resolution as a way to "stop bloodshed" in Yemen.

Iran summoned the Saudi envoy Friday to protest after his country's warplanes allegedly turned back humanitarian aid flights headed for war-torn Yemen, whose airspace is controlled by a Saudi-led coalition.

Aboard the flights were women and children who had been treated in Iran after being wounded in "terrorist" attacks before the coalition launched its air campaign against Tehran-backed rebels in Yemen last month, state news agency IRNA said.

Saudi Arabia said Friday it had foiled a bomb plot by the Islamic State group and blamed the jihadists for shooting dead two policemen in the capital earlier this month.

The authorities said three bomb-laden cars had been seized during investigations into the killings.

Saudi Arabia executed a Jordanian man on Friday for drug trafficking in the ultra-conservative kingdom, the interior ministry said.

Mohammed Abu Samak was arrested "as he was smuggling a large amount of banned amphetamine pills," said a ministry statement carried by the official SPA news agency.

Saudi-led coalition air strikes hit a camp housing rebel troops in Yemen's third city Taez on Friday, after a night of clashes and raids throughout the war-hit country, residents said.

Warplanes struck the camp, which was being used by a rebel army unit loyal to ousted president Ali Abdullah Saleh in central Taez, they said.