An Indian state has shut high schools and colleges after a row over the hijab that has gained international attention after Nobel Prize-winner Malala Yousafzai weighed in.

The government of Karnataka state in southern India took the decision after protests by students over Muslim women wearing headscarves in the classroom escalated into violence, reports BBC.

The state's high court is set to continue hearing a petition that argues for the Muslim women on Wednesday.

The developments occurred after protests by six teenage students at a government-run college over wearing hijabs spread to other colleges.

Several Hindu students then turned up wearing saffron shawls - the colour seen as a Hindu symbol - to protest against Muslim women wearing hijabs.

India row over right to wear hijab deepens

On Tuesday, Malala - who was 15 when she survived an attack by the Taliban in Pakistan for speaking up for the right of girls to be educated - called on India's leaders to do something to "stop the marginalisation of Muslim women".

"Refusing to let girls go to school in their hijabs is horrifying," the 24-year-old activist tweeted. "Objectification of women persists - for wearing less or more."

In India, the stand-off has increased fear and anger among minority Muslims, who say the country's constitution grants them the freedom to wear what they want.

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On Tuesday, viral videos showed a Muslim woman being heckled by a mob of young men shouting slogans, and heated arguments between students wearing hijabs and saffron shawls.

In a rare move, the judge hearing the case appealed to students and others to "maintain peace and tranquillity".

How did the row begin?

The issue began gaining attention when six teenage students at a government-run pre-university college - equivalent to a high school - in Karnataka's Udupi district began protesting over being barred from classes for wearing a hijab.

Udupi is one of three districts in Karnataka's communally sensitive coastal region - a stronghold of Prime Minister Narendra Modi's right-wing Bharatiya Janata Party (BJP). Commentators often describe the region as a laboratory for majoritarian Hindu politics. The BJP is also in power in Karnataka.

The issue gained national attention after six women began protests at an Udupi college

The college said it allowed students to wear the hijab on campus and only asked them to take it off inside the classroom. But the protesters - who all wear the mandatory college uniform - argued they should also be allowed to cover their hair in the classroom.

"We have a few male teachers. We need to cover our hair before men. That is why we wear a hijab," Almas AH, one of the students, told BBC Hindi.

The students denied allegations that they were acting at the behest of the Campus Front of India - the student-wing of the radical Islamic group, Popular Front of India - who were advocating for them.

It's not unusual to see women wearing hijabs and burkas (the full Islamic veil) in India, where public displays of symbols of faith are common. But the college principal said it was necessary for the teacher to see the student's face and the uniform helped them ensure there was no discrimination among students.

Repeated meetings between the students, college officials and government representatives couldn't solve the stand-off.

How did it spread to other colleges?

The issue of Muslim women wearing hijabs had cropped up in a few other colleges in Karnataka earlier too, but it started gaining momentum when photos of the women protesters in Udupi went viral.

Soon, Hindu students in some other colleges began coming to classes wearing saffron shawls - this forced officials to insist that both couldn't be allowed on campus.

Last week, a video showing gates being shut on a group of hijab-clad students - shot at a pre-university college in Kundapur in Udupi district - had led to outrage.

Groups of Hindu students - both male and female - also began going on marches against their classmates wearing hijabs.

But there was no violence until Tuesday - hours before the court began hearing the petition, incidents of stone-throwing and even arson were reported from some cities.

Local authorities imposed Section 144 - a colonial-era law that prohibits the gathering of more than four people in one place - to curb the protests.

In Shivamogga district, a group of male students were caught on camera hoisting a saffron flag at their college, prompting the government to announce an inquiry.

In Mandya district, a viral video showed a young woman in a burka being approached by a mob of men with saffron shawls. As they yelled Jai Shri Ram (hail Lord Ram) repeatedly, she stood her ground, shouting "Allahu Akbar" (God is great) as college authorities escorted her away.

Later, the woman - identified as Muskan - said her college principal assured her that he would support her.

"A few other Muslim girls were also heckled in a similar manner. The college administration and the principal never prevented us from wearing the burka, so why should I listen to outsiders?" she told The Indian Express newspaper.

A senior police official told BBC Hindi that these were all "minor incidents" and that the situation was in control.

What has the state government said?

Karnataka Education Minister Nagesh BC has backed college authorities who say both saffron scarves and headscarves should be banned on campuses.

He has also alleged that the students are being instigated to protest by "miscreants".

"It's basically politics. All this is happening because state assembly elections are due next year," Mr Nagesh told BBC Hindi, referring to attempts by the Popular Front of India's political wing to gain traction in the region.

Chief Minister Basavaraj S Bommai and the state's home minister have urged the students and others to "maintain peace and harmony".

What has the court said so far?

Two petitions have been filed on behalf of the protesters.

One argues that choosing what to wear is a fundamental right guaranteed by India's constitution. The other questions the legality of a recent state government dress code order for educational institutions, which bans headscarves and hijabs.

Their lawyer appearing has argued that the government's order on banning the hijab is both unconstitutional and illegal - he has also asked the court to pass an interim order that will allow the students to attend classes ahead of exams.

Justice Krishna Dixit has said he would act according to the constitution. "I will act according to the oath of office which I took. It is not a healthy situation that students should be outside the classrooms," he added.