Hundreds of people, including many women and children were killed in ethnic violence near the city of Jos in Nigeria at the weekend, officials say.
They said villages had been attacked by men with machetes who came from nearby hills.
Troops have now been deployed in the area and dozens of arrests are said to have been made.
BBC News website readers in the area have been getting in touch with their experiences.
IBRAHIM, JOS, STUDENT, MUSLIM
Over the weekend I heard people saying that there were conflicts in some villages in the Zot and Dogo-Nahawa areas in the southern parts of Plateau state.
Later in the evening as I was watching the TV News the media spoke about the areas affected. They spoke of corpses, injured people, refugees and destroyed properties.
On Monday, in Jos North - the area where I live, I saw people yelling and running for their lives and saying that people were killing each other. Houses and properties in some parts of Jos North were burnt.
I believe the state's indigenous people were attacking the settlers, while the settlers were also retaliating.
It is becoming calm now as most traders have closed their shops and have gone home for their own safety.
I can see smoke in the distance. The police presence is not large, in fact I can't even see one on my street.
I think the federal government should take immediate measures that will resolve the problems in the state and avoid any future violence.
OGUNDELE, JOS, STUDENT, YUROBA
The violence started early Sunday morning. We heard that people were already dead in the villages. I live in the city.
The Hausa Fulani people entered the Dogo-Nahawa village and they killed women and children with machetes and shot them with guns.
Everyone is staying at home. Everywhere is locked down. People are panicking.
There is no one to blame except the government. There needs to be enough opportunity everywhere for everyone. Religious groups need to educate their people.
Rumours are being spread and that is making people afraid. People are panicking and telling their loved ones to come home.
There is a heavy security presence. The army has been deployed and armoured cars are moving about the city.
But we are hearing news of "silent killings" in the city as the city has been divided. The Muslims have their side and the Christians have theirs. If you are a Muslim you dare not go in to the Christian areas and the Christians do not dare go to where Muslims are. If anyone crosses to the other side by mistake, they will kill such a person.
Over the past decade our experiences in the northern part of Nigeria - Jos to be specific - have been drastic as life and property are being destroyed. In fact, the experience is not very different from a war, and worst of all the economy in the state seems to be paralysed.
Please continue to pray for us, what we need is God's divine intervention.
EKE, STUDENT, NORTHERN NIGERIA
It all started when we were asleep. We started hearing gun shots and the sound of machetes. Although we are all aware of a possible attack from the Fulani herdsmen some of our leaders got the information by text message.
We got up and ran to the nearby bush not knowing that they had ambushed some of our neighbours and killed them with machetes. It was a terrible sight to behold, as hundreds of dead bodies were spread everywhere.
The 500 killed were all Christians. The Muslims asked us to vacate Jos but we were living there even before they came as herdsmen.
I hereby plead with the international bodies to help us in our struggle for the division of Nigeria in to three (Igbo, Hausa, Yoruba) for lasting peace to reign. Light and darkness do not work together.
Hundreds of lives and property worth millions of naira were lost on Sunday.