Prime Minister David Cameron spoke with Arlene Foster and with Martin McGuinness following the Northern Ireland elections.
A Downing Street spokesperson said:
The Prime Minister telephoned Arlene Foster today, following the Northern Ireland elections. The Prime Minister congratulated Arlene Foster on her re-election and they spoke about the importance of maintaining a strong and stable devolved administration in Northern Ireland.
The Prime Minister also telephoned Martin McGuinness to congratulate him on his re-election, and reiterate his commitment to work closely with him, and the new Executive when it is formed.