ALGIERS — Algerian authorities on Saturday ordered an early start to the spring university holiday, an apparent attempt to weaken two weeks of student-led protests against President Abdelaziz Bouteflika.

The Higher Education Ministry’s decision came a day after tens of thousands of demonstrators packed central Algiers to challenge the veteran leader’s 20-year-old rule in the biggest protests in the capital in 28 years.

Without giving a reason for the move, the Ministry said in a decree that the spring break would be brought forward by 10 days, starting on Sunday instead of March 20.

Algerians desperate for jobs and angry at unemployment, corruption and an elderly elite seen as out of touch with the young have taken to the streets since Feb. 22 to protest the 82-year-old’s plans to seek a fifth term in an April 18 election.

Many of the demonstrations started at university premises before spilling out onto the streets.

The ailing Bouteflika is in hospital in Geneva and has rarely been seen in public since suffering a stroke in 2013.

On Thursday he issued his first warning to protesters, saying the unrest, now entering its third week, could create chaos in the oil- and natural gas-producing North African country.

Bouteflika has offered to limit his term after the election and has vowed to change the “system” that runs the country, but the protest movement has galvanized discontent among different sectors, particularly students and young families.

Some long-time allies of Bouteflika, including members of the ruling party, have expressed support for the protesters, revealing cracks within a ruling elite long seen as invincible.

Friday’s protests were largely peaceful but some clashes between youths and police broke out in the evening and state media said 110 protesters and 112 policemen had been hurt in the unrest.

Algeria’s oldest museum, home to some of the country’s most valuable art, was vandalized during protests, the culture ministry said on Saturday.

“Criminals” took advantage of thousands-strong demonstrations on Friday to break into the National Museum of Antiquities and Islamic Arts in Algiers, founded in 1897, the ministry said in a statement.

“Part of the museum was ransacked, objects stolen and administrative offices burned, as well as documents and records being destroyed,” the ministry said.

Firefighters arrived promptly and prevented the blaze from spreading, while police had managed to retrieve a sabre dating from the time of the Algerian resistance to the French conquest of Algeria in the early 19th century, it said. — Agencies