The BBC News website spoke to Damka Pueba, a worker for a civil society organisation who was at the scene of the attack on the Agip oil company's offices in Port Harcourt, Nigeria.
I heard the first sounds of gunfire from the Agip compound at about two-thirty in the afternoon.
I saw police and local people rushing to the building just as the workers were running out of it. Things were happening so fast.
Many of the workers were crying. They said they had hidden during the attack and had seen several people getting killed, many of them police.
Relatives of people who worked in Agip gathered at the gates of the compound. Many locals started weeping when they heard that one of their community, a civilian, had been killed.
One of the workers said the attackers had been wearing military-style camouflage uniforms. Apparently, they came and left by boat, using the jetty.
I cannot say why the Agip compound was attacked. Some people were saying the gunmen took away bags of money.
The Agip compound is home to expatriate workers and some Nigerians. There is a clubhouse, with a swimming pool and other facilities that locals sometimes use.
Compared to the Shell oil facility, I wouldn't say security there is particularly tight.
A huge crowd had gathered at the scene after the attack. There must have been some 800 people, including police.
People are angry and afraid. They feel nobody is safe anymore.