The guards were killed in a slight border skirmish when attackers shot at the patrol near Arar.
The explosion left a hole in the wall of the building but no fatalities were reported.
Saudi Arabia closed its Baghdad embassy in 1990 after the late Iraqi dictator Saddam Hussein invaded Kuwait.
The U.S. State Department expressed concern over the detention of a senior opposition leader on Wednesday, saying it would further inflame tensions in the country.
The man was one of 23 men wanted by Saudi authorities, who accuse them of serving the agenda of a foreign power.
The High Court in Cairo ordered a retrial last week on the grounds of procedural flaws in the trial.
The U.S. State Department said that it was concerned that an arrest of such a senior leader could inflame tensions in the country.
Three journalists are expected to remain in jail until they appear in a new court for retrial, a defence lawyer was quoted as saying.
No one claimed responsibility for the suicide bombing, but it resembles previous attacks carried out by al Qaeda in the Arabian Peninsula (AQAP).
Sheikh Ali Salman, head of the al-Wefaq Islamic Society, was arrested on Sunday after leading a protest rally against last month’s elections.
Libya is surviving on a mere 128,000 barrels per day from fields connected to the eastern port of Hariga, an oil official said.
The verdict was announced by the chief prosecutor of terrorist crimes who said that the three were among 12 people charged with a bomb attack in February that killed the policeman.
Greste’s brothers, Mike and Andrew Greste, told reporters in Australia they did not believe their brother would be released before the appeal.
A lawyer who represents al-Wefaq said the charges against him include incitement against the government, calling for its overthrow by by force and inciting the youth to revolt.
Although Russia has invited opposition groups to participate in peace talks it did not specify which groups were invited.
The officials did not specify the nature of violation that occurred during the rally.
The Observatory, which monitors Syria’s war with a network of sources, said the pilot was believed to have an Arab nationality.
Egyptian President Abdel Fattah al-Sisi suggested in November he was considering pardoning Greste and two other journalists of Qatar-based Al Jazeera television.
Activists say that the death toll since the military campaign was launched in late September was probably higher among the hardline Islamist insurgents.
Ties between Cairo and Doha deteriorated after Sisi removed the previous president Mohamed Mursi from power in July 2013 following mass protests against his rule.
The dead were behind the killing of a member of the security forces and wounding of another last week, a ministry spokesman said.
The bomb explosion occurred in Bani Jamra, a Shi’ite village northwest of the capital Manama.
A UN official said that Iraq has requested a one-year deferral of a $4.6 billion reparations payment for destroying Kuwait’s oil facilities during the Gulf War.
Interpol this month issued a Red Notice alert for Sheikh Youssef al-Qaradawi in connection with several alleged offences including murder, arson, vandalism and theft.
Widely seen as a failed state, Yemen remains one of the gravest threats to stability in the Gulf and beyond.
Differences still exist between the six GCC states over issues relating to Egypt, Libya and Iran.
The police force, which will be known as GCC-POL, and the naval force will help the Gulf states to counter risks posed by terrorist militant groups in the region.
The 11 were accused of membership of al Qaeda’s Nusrah Front Syrian wing and another militant Syrian opposition group, Ahrar al-Sham.
The GCC members face chaos in Yemen, Syria and Iraq, political turmoil in Egypt, sectarian tensions and a falling oil price.
Sheikh Sabah said that one of the ways to encounter the oil price slide was greater economic integration within the GCC.