Israeli forces have neared the centre of Gaza City, as Hamas fighters reportedly regroup amid fears of intense street-to-street fighting. Thousands of Palestinians have been forced to flee the city since Israel launched its ground offensive last week. Israel describes the city as the 'last stronghold' of Hamas and says its aim is to 'eliminate terrorists' and rescue its 48 remaining hostages, 20 of whom are thought to be alive. The BBC has verified footage of an Israeli tank at Hamid Junction, around 1.5km (0.9 miles) from the central al-Shifa hospital. Israeli armoured vehicles were also reportedly seen close to the main UN compound in southern Gaza City, about 700m (2297ft) from the centre. The BBC has spoken to a Hamas figure who claims the militant group is willing to call thousands of fighters into the city, raising the fear of intense fighting in dense urban areas where thousands of civilians remain. The journey has become prohibitively expensive for fleeing families, with costs over $3,000 (£2,450). Those remaining in Gaza City face the constant threat of bombardment and dwindling resources.