At 1 a.m officials began tallying the so-called double envelope votes cast by diplomats, security forces, handicapped citizens, hospital patients and staff, and prisoners. Those votes make up some five percent of the overall vote. The vast majority of them are the votes of soldiers, which traditionally skew to the right (and usually dont go to ultra-Orthodox or Arab parties) and could affect the final distribution of seats.
According to results released at 5:17 a.m. Blue and White was still slightly ahead, having garnered 1,035,635 votes compared to 1,010,246 for Likud.
Read more here.