Houthi militants in Yemen fired after last night's U.S. and British# airstrikes against Houthi targets.

GEOFF BENNETT: U.S. officials say the# airstrikes are a bid to stop the Houthi## disruption of shipping through the Red Sea# and not intended to widen the wa As Nick Schifrin reports, the U.S. warned it will# strike again if the Houthi campaign continues.

NICK SCHIFRIN: For as far as the eye could# see, pro-Houthi demonstrators today filled## the streets of the capital, Sanaa, waving# weapons, demanding death to their enemies,## a promise repeated by Houthi# leader Mohammed Ali Al-Houthi.

MOHAMMED ALI AL-HOUTHI, Head of Houthi Supreme# Revolutionary Committee (through translator): Did## have seen?

They did not bring anything new, but# we are the ones who will bring something new.

NICK SCHIFRIN: Last night, from# jets, ships and a submarine,## the U.S. says a first round of# strikes targeted 16 location and then 30 to 60 minutes later an additional# 12 locations with more than 150 munitions.

A Western official told "PBS NewsHour"# that was on the higher end of military## options.

The U.S. military says it hit more than# 60 individual targets in mostly unpopulated area targeting air defense, drones and missiles# that the Houthis have used in recent attacks,## including the Tuesday attack that# precipitated the military strikes,## more than two dozen Houthi drones# and missiles aimed at U.S. warships.

JOE BIDEN, President of the United# States: If they continue to act,## behave as they do, we will NI CK SCHIFRIN: Since November, Houthis have seized# and targeted 27 30 percent of global container traffic# and more than a million barrels of## crude oil every day sail through# the Suez Canal via the Red Sea.

Now, many of those ships# are rerouting around Africa,## driving up consumer prices and causing# supply chain delays.

This mo crude oil futures jumped 4# percent to more than $80 a barrel.

The international reaction to the military# strike was mixed.

Russia called an emergency## Security Council meeting and called the strikes# irresponsible.

Oman denounced the strikes,## warning they could escalate conflict# in the region.

Saudi Arabia said in## a statement it was following the events with# great concern and called for self-restraint.

For nearly 10 years, Houthi rebels backed by# Iran have been fighting a Saudi-led coalition.## Houthis seized the capital, Sanaa, in 2014# from the country's internationally recognized## government.

The subsequent brutal civil war# has killed hundreds of thousands of Yemenis,## but for the last 20 months,# there's been a shaky cease-fire.

Houthis and the Saudi-backed Yemeni government# now agree on a road map to peace, and some## regional and U.S. officials worry that military# strikes could reverse political progress.

But## that could depend on what happens next and the# extent of the expected Houthi military response.

For the "PBS NewsHour," I'm Nick Schifrin.