Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Nuclear Security Summit
Table title:
History
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Host leader </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > April 12–13, 2010 </td><td class="highlighted"  colspan=1 rowspan=1 > United States </td><td class="highlighted"  colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > Barack Obama </td></tr>
<tr> <td colspan=1 rowspan=1 > March 26–27, 2012 </td><td colspan=1 rowspan=1 > South Korea </td><td colspan=1 rowspan=1 > Seoul </td><td colspan=1 rowspan=1 > Lee Myung-bak </td></tr>
<tr> <td colspan=1 rowspan=1 > March 24–25, 2014 </td><td colspan=1 rowspan=1 > Netherlands </td><td colspan=1 rowspan=1 > The Hague </td><td colspan=1 rowspan=1 > Mark Rutte </td></tr>
<tr> <td colspan=1 rowspan=1 > March 31–April 1, 2016 </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > Washington, D.C. </td><td colspan=1 rowspan=1 > Barack Obama </td></tr>
</table>
Question:
Where and when was the first Nuclear Security Summit held?
Answer:
The first summit was held in Washington, D.C., United States, on April 12–13, 2010.