UNHCR has expressed alarm over growing insecurity along the Chad-Sudan border, where a raid on Monday by 150 armed men just a few kilometres from a refugee camp left four Chadian civilians dead and five others wounded. The Chadians were killed in an attack near the village of Dolola, in south-eastern Chad. Dolola is near UNHCR's refugee camp at Goz Amir, which currently shelters some 17,700 Sudanese refugees from Darfur.