Difference between @(posedge Clk); a<= 1'b1; and @(posedge Clk) a<= 1'b1;

Question

Is there any difference between

@(posedge Clk);
   a<= 1'b1;

and

@(posedge Clk)
   a<= 1'b1;

Note the semicolon after Clk. I came across similar lines of code when I was browsing through a testbench. I did some simple experiments and I could not find any differences during simulation. Will the sequence of execution for the code following these lines change in any way due to the presence/absence of the semicolon?