Yemen's dominant Houthi movement launched Katyusha rockets into Saudi Arabia on Sunday and residents reported Saudi-led air strikes in a Yemeni border province in exchanges that threatened to derail a 48-hour truce.
A Saudi soldier was killed on Saturday by a missile fired by Yemeni rebels across the border into the kingdom's southern Asir province, the interior ministry said.
Opec is moving closer towards finalising this month its first deal since 2008 to limit oil output, with most members prepared to offer Iran significant flexibility on production volumes, ministers and sources said.
The energy minister of Saudi Arabia said on Thursday he was optimistic about Opec's deal to limit oil output and mentioned the lower end of a previously agreed production target, helping spur a rally in the price of crude.
Saudi Arabia's commerce minister said Wednesday that the kingdom is seeking reciprocal treatment on visas, after critics said the introduction of higher fees risked deterring investment.
Saudi Arabian Energy Minister Khalid al-Falih is expected to travel to the Qatari capital, Doha, this week for meetings with oil-producing countries on the sidelines of an energy forum, three sources familiar with the matter said.
Saudi Arabia has a "very comfortable" level of foreign reserves, the central bank chairman said on Monday, despite a drawdown in assets to help cover a fall in oil revenue.
Saudi Arabia's government has set aside 100 billion riyals ($26.7 billion) to pay debts that it owes to private sector companies after payment delays that have lasted months, an official document seen by Reuters shows.
Gulf OPEC members Saudi Arabia and Kuwait have kept their oil production steady in October compared to the month before, according to official numbers submitted to OPEC, industry sources familiar with the matter said.
Tunisia's religious affairs minister was fired on Friday for "attacking the foundations of diplomacy" after he publicly suggested the conservative form of Islam practised in Saudi Arabia had links to extremism.
Islamic State leader Abu Bakr al-Baghdadi urged his fighters in an audio recording posted online on Thursday not to retreat from the northern Iraqi city of Mosul, but also to invade Turkey and attack Saudi Arabia.
Saudi authorities said Sunday they had foiled a plot to bomb a football stadium during a World Cup qualifying match and dismantled two "terrorist" cells linked to the Islamic State group.
