"The equation is different, the confrontation is different, and they will pay a harsh and expensive price," coalition spokesman Brigadier General Ahmed al-Assiri told reporters.
"The safety of Saudi Arabia is a top priority for the coalition and the Saudi armed forces. It is a red line they crossed."
Shells fired from Yemen killed five people in the kingdom's Najran region yesterday in a second day of cross-border bombing blamed on the Iran-backed Shiite Huthi rebels, civil defence authorities said.
In Jazan district adjacent to Najran, a missile killed a husband and wife on Tuesday, the civil defence department said.
It was "killing for the sake of killing," Assiri said.
State television today reported further strikes but said they landed in an uninhabited area.
"Now the confrontation is targeting Saudi Arabia's borders, targeting Saudi citizens, targeting the safety and security of Saudi cities. Here we confirm that this is unacceptable," the spokesman added.
The Huthi stronghold of Saada, in northern Yemen, will be among the areas in the coalition's sights, Assiri said.
Hours earlier, Saudi Foreign Minister Adel al-Jubeir proposed a five-day ceasefire to allow aid into Yemen but said the Huthis would have to abide by it.
The coalition took action in March after Riyadh feared the Huthis would take over all of Yemen and pull it into the orbit of the kingdom's Shiite regional rival Iran.
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