Kan played down the incident, noting that the evening ended without any other incident as Greece, Belarus, Serbia, Cyprus, Estonia, Czech Republic, Australia, Iceland, San Marino and Slovenia made it through to Saturday's finals.
A missile fired from Israel's Iron Dome air defence system, created to intercept short-range rockets.
More than 60 LGBT+ groups across Europe have advocated for a boycott of this year's Eurovision Song Contest as well as a wide variety of celebrities. Four Israelis and 25 Palestinians were killed during the escalation.
Once those 10 are taken, those 20 acts will perform the Grand Final alongside representatives from the host country, Israel, and "the big five" - Italy, Spain, France, Germany and the UK.
Palestinian activists have responded, calling Eurovision an "artwashing [of] Israel's brutal oppression of Palestinians".More news: Watch the Super Mario Maker 2 Nintendo Direct here
The first of the two semifinals in the Eurovision Song Contest began in Tel Aviv on Tuesday night, with participants from 17 nations competing in the first round for the right to compete in Saturday's final, and hoping to bring the contest home to their country next year.
The "Queen of Pop" and best-selling female recording artist of all time explained her decision to perform at the popular competition in Israel, saying, "I'll never stop playing music to suit someone's political agenda nor will I stop speaking out against violations of human rights wherever in the world they may be".
There will be a second Eurovision elimination round in Tel Aviv on Thursday.
Sand did not say what issues were delaying the signing of a contract, but confirmed that negotiations were in a "final stage".
"The protesters are concerned that whole of Israel needs to be seen as an occupying force and it should be boycotted in its entirety", he added.More news: United States records 839 cases of Measles
The BDS - modelled after the South African anti-apartheid movement - was formed in 2005 by more than 200 Palestinian civil society organisations, urging non-violent pressure on Israel until it complies with worldwide law.
Israel has been accused of building settlements on occupied Palestinian lands that are considered illegal under global law.
The Palestinian-led boycott movement against Israel has urged artists to skip Eurovision in Tel Aviv.
Demonstrators have vowed to continue their protests throughout the week's event.
Israel earned the right to host after Israeli singer Netta Barzilai carried off last year's prize with her spunky pop anthem "Toy".More news: Trump poised to sign order restricting foreign telecom firms